[KJS]

Stay on it until you're 100% satisfied with the final result. Stay in contact with GM Customer Service. Keep detailed records of who, when and all the facts everytime you communicate with everyone. Escalate to the general manager or dealerhip owner as appropriate. If they tell you its normal ask to drive a similar year Camaro on the lot and decide for yourself.
If you can, try to get a friend or relative to go with you who is somewhat car savvy to take good notes and not getting personally involved. As much as it can seem personal, keep it factual and detailed. In the long run, if you are still not satisfied you might want to try using a different dealerships service center. Good luck and hang in there.