2004 GMC ENVOY XUV User Comment / Complaint

I have a 2004 gmc envoy. it has two bucket seats and a second row bench seat and a trunk that is separated by a panel with a glass inside the panel. i guess i have rolled this window down 5 times since i have owned it and now the glass will not roll up or down. i took it to a shop and they said the part (regulator) is on back order from gm. this means only one thing that they have had nothing but problems with it. i called the dealer i purchased the vehicle and of course they honor nothing and in fact had sold out and did not know where my papers were at on the vehicle. this was the reason it took me 34 years to purchase another gm vehicle. i got burned as a green kid out of college with my first job and purchased a gm and got screwed by the sales person in the checkered coat. go figure. on top of all this, the radio face has turned from black to yellow as the paint of all things has started coming off of the radio. why was the plastic not molded black plastic instead of yellow plastic and painted. dealer said it was not under warranty as it was past the miles. well that stinks as i had the truck less than a year at that point. i travel a lot in my job and put a lot of miles on the vehicle, but that should not have anything to do with the radio or window regulator. what can i do?