, this is not the place to hang your laundry. Contact GMC Customer Service via private message. It's almost guaranteed you won't get a response from GMC here. Why are you bothering them with an out of warranty problem and an issue between you and an outside vendor anyway?
Do you REALLY expect GMC to help you get your car put together?
2007 Acadia SLT-2, 'HiYo' Silver outside, Ebony/Titanium inside, no NAV, no HUD, no errors