When I turn the wheel, the car will go towards that direction but the steering doesn't bring itself back to center as it used to before I got an alignment. When I am on a perfectly flat road, the

tighten or change power steering pump belt if persist replace power steering pump

Could be one of the following:
Are the front wheels turned? If so, turn the steering wheel hard, in the same direction as the front wheels while turning the key to towards the ON position. Also try rapidly turning the steering wheel back and forth while trying to turn the key to ON. Also, if you have a tilt steering wheel try moving it up and down as well.

Is your key worn? Try a spare key. Or have a new key made. (may help)

The switch itself is jammed and will have to be replaced.

Since the slop is gone, it is probably an alignment problem now-check for binding but in most cases it is a caster issue.

most cars have a steering lock that engages when you turn off the car. If you try wiggling the wheel while you turn the key, that might free up your steering. If just wiggling it a little does not work, try pulling it one way and turning the key, giving it a little force turning the wheel (sometimes the wheel locking mechanism gets stuck) ... if it still doesn't work, try turning the wheel the other way and turning the key. If you are still locked up .. you'll probably need to see a mechanic about it. Hopefully the wheel lock is just a little stuck and you can free it up yourself -- it's free that way :-)

1. Turn the steering wheel from side to side until it locks into place. This will make the process a bit easier, as the wheel won't be turning as you work.

2 Remove the horn button in the center of the steering wheel by pulling it off towards you. This will expose the steering wheel nut at the center.

3 Unbolt the center bolt from the steering wheel, using the 1/2-inch ratchet, extension and socket. This might free the steering wheel right away, but most likely you'll have to proceed to the next step.

4 Position the steering wheel puller on the steering wheel such that the center bolt on the puller is on the center shaft of the wheel. Then thread in the bolts supplied with the puller into the two threaded holes on either side of the center shaft on the wheel.

5 Tighten down the center bolt on the steering wheel puller using the 1/2-inch ratchet and socket until the steering wheel pops free. Then remove the steering wheel puller from the steering wheel.

I had two or three mechanics look at it but I ended fixing it myself at no cost but time. The clock spring is unlikely the culprit as it is housed and there is not much too it to wear out since it's a ribbon (as in computer) at a high cost of $300. The ground circuit is broken by dirt and grime by now. Unfortunately you have to remove the airbag and steering wheel. 1). Dive the car straight and park to set the steering true straight. 2). remove the Red positive cable from the battery. 3). Loosen throughly the two Torx screws that hold the airbag in place. If you have radio controls, remove that first. Tip: If it doesn't loosen, apply outward pressure to the assembly so the screw will take and unscrew. The airbags has horizontal clips, so, jiggle side to side and lift one side up and it should remove. Unhook the cable. 4). Unhook all cabling and remove the steering wheel. I use a liquid wrench type lube and looened the nut and jiggled the wheel off without a puller. The nut keeps it from hitting you. 5). Remove coil spring. 6). Remove the clamshell housing (couple/few screws). 7). Place newspapers on the floor and under the steering and spray the heck out of the bearings as well as the u-joint towards the floor with carb cleaner, then WD-40. I used an entire can of carb cleaner just to make sure. 8). Put it back together but before screwing in the clock spring, make sure you wind it till it stops then back off 2.5 turns so there is play for wind and unwind as the steering is about 4 turns total. I actually didn't do this (thinking I didn't move it) but my wife took the car and forced the steering breaking the ribbon. So actually, it cost me $300 to replace the clockspring that was perfectly fine. I took it apart and attempted to re solder but the horn kept going off by itself, and there is the danger of the airbag going off too. Not worth it. My steering wheel was never centered right, so I kept driving around the block without the airbag, until the steering wheel was centered before putting everything together.

Check both front wheels with the steering wheel centered. One or both may appear to be pointing in the wrong direction slightly. Check both sleeves on the tie rod ends to make sure they are tight and not able to turn. (adjustment sleeves are slightly different than on most cars. One sleeve extends from the drivers side across the front and is about 21/2' long the other is shorter and is about 5" to the passenger side of the pitman arm on the steering box. If either moves, turn it 'till the wheels are fairly straight, tighten the bolts that are on the clamp around the slotted tube, and bring it to an alignment shop and have the toe in re-set.
A condition such as this is nothing to mess with. loss of steering is extremely dangerous.

First you need to go to the local parts store and get a steering wheel puller and a clock spring compressor tool. You can rent them but just cheaper to buy it and return it. I got mind like 35 bucks together.
You will remove the horn button just by pulling it towards you be careful not to rip the horn wire out. Next there may be a retainer clip remove it with a pair of needle nose pliers. Next get a breaker bar or a impact gun to back the center nut off. Once off use the steering wheel puller by inserting the threaded bolts into the threaded holes directly beside the center pin. ease the puller onto the center pin and tighten down until the steering wheel starts to move back towards you continue until off. On some trucks there is a steel plate covering the housing to the left side and towards the top are two small torx screws remove them and remove the cover. Next grab your clock spring compressor and install it similar to the way you did the wheel puller you will tighten down the center bolt slightly decompressing the clock spring. as you compress the clock spring look to the center there is a small retainer clip that looks like it is made into the center pin pry the clip off making sure not to damage it and remove the compressor tool, remove the clock spring making sure to pay attention on how it comes apart you can put it all back together. Remove the turn signal switch should be 3 phillips head screws. You may need to disconnect the horn wire at this point it just turns slightly and pulls out. After you remove the clock spring you will see the lock cylinder body, follow the body towards the center pin. There will be a small torx bit or a phillips screw to it will be silver and very shinny at the end of the lock housing remove it and slide the lock cylinder out. Install the new one and reverse the steps.
hope this helps...........good luck!

First you need to go to the local parts store and get a steering wheel puller and a clock spring compressor tool. You can rent them but just cheaper to buy it and return it. I got mind like 35 bucks together.
You will remove the horn button just by pulling it towards you be careful not to rip the horn wire out. Next there may be a retainer clip remove it with a pair of needle nose pliers. Next get a breaker bar or a impact gun to back the center nut off. Once off use the steering wheel puller by inserting the threaded bolts into the threaded holes directly beside the center pin. ease the puller onto the center pin and tighten down until the steering wheel starts to move back towards you continue until off. On some trucks there is a steel plate covering the housing to the left side and towards the top are two small torx screws remove them and remove the cover. Next grab your clock spring compressor and install it similar to the way you did the wheel puller you will tighten down the center bolt slightly decompressing the clock spring. as you compress the clock spring look to the center there is a small retainer clip that looks like it is made into the center pin pry the clip off making sure not to damage it and remove the compressor tool, remove the clock spring making sure to pay attention on how it comes apart you can put it all back together. Remove the turn signal switch should be 3 phillips head screws. You may need to disconnect the horn wire at this point it just turns slightly and pulls out. After you remove the clock spring you will see the lock cylinder body, follow the body towards the center pin. There will be a small torx bit to it will be silver and very shinny at the end of the lock housing remove it and slide the lock cylinder out. Install the new one and reverse the steps.