Had laptop fixed now no internet

There could be several things happening.
First, you didn't say what had been fixed.
I'm assuming you have a wireless connection, but you didn't say.
Assuming it is wireless, it needs to be turned on. The computer in question could have a switch on the case, so if it does, then turn it on.
If there is no switch, then a combination of the Fn switch and one of the special function keys (should have an icon to represent a wireless connection). If that doesn't work, check to see if the wireless adapter is, indeed, installed in the device manager.
There is always the possibility that whoever "fixed" it left the wireless modem out of the case.