You just answered your own question. Personally, since you have had continuous problems, I would call GM and complain. But I would also take to someplace else and get it fixed right. If (and a big if IMO) GM decided they will cover it, you could get reimbursed. But, if they don't, you at least get it fixed. 4 years on a 06, and your still dealing with an accident that happened well over 2 years ago, not sure what they will do about it now.