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Most likely the small flex cable on the LCD screen in the top part of the phone needs replaced. The speaker in the earpiece must be bad and it is soldered to this flex cable. It can be repaired by a cell phone repairman.
As you describe it, your problem is the keypad. Maybe dirty or wet inside though that part is a totally replaceable pad with a connector only so you must buy a replacement and replace the broken one.
About how to do that: being the razr a common phone is pretty sure you'll find guides, photos and maybe videos around the web, googling, guiding you on how to do it. Maybe the shop where you buy the replacement can have a forum or guides. The other option is to pay a technician to do it.
If the phone is under 1 yr old I suggest finding the nearest Motorola service center as it is under warranty. If its not covered you could replace the speaker yourself, although would require a small amount of soldering or replacing the entire LCD module which could be expensive. Let me know if you decide to give it a try I can help w/ disassembly.