My invoice does not have a breakdown of parts and labor. When asked for high cost, I was told parts of Hummer are expensive. one item of repair: $855 for a fallen window. I checked cost of window engine from GM, it is below $100. If I do not hear from management, I will seek other avenues. When I asked for breakdown of part and labor on my invoice, I was told they do not do that, it is only one number for total cost. It is unheard of.