Many here have reported that when coming back from having service done, some of the car settings have been reset. So things like bluetooth have to be paired again, location based charging, etc. Not sure if that applies to you, but thought I'd mention it. The key fob was an odd item, but if it happens again do a search on this forum as there have been a few threads about car fob issues.Thanks to all you senior members for your comments they are taken to heart. And maybe my luck has changed because the blue tooth started working correctly again and I really like being able to text while i'm driving home. This morning however, after opening and closing the hatch to put something in the back the doors would not unlock. I had to open the car with my phone app. I then went back into the house and borrowed the second remote from my wife which worked fine. When I got out of work my own remote worked again. So there you go. Its all a miracle to me. But yes my sweet electric grin is back on my face.
Here's one that might interest you.
http://gm-volt.com/forum/showthread.php?269633-RKE-oddness&p=3766153#post3766153
Congrats on getting your car back and wish you the best of luck moving forward.