Ticked Off Need Someone at GM

[Sublime22]

I have had issues up the you know what with my '04 GP GTP that was a certified used car. Now I have been around cars my entire life, and I could probably guarantee the inspection necessary to certify this POS was never done. The dealer has a oh well attitude, even after my entire family has been buying cars there for 15 years, from my grandmother to my little brother.
I have a leaking roof at 48K miles, replaced the belt which shredded in 3 months, exhaust flange is loose, headlights were unadjusted, oil pan gasket was blown, and it was the only thing covered on this "certified" POS, and there is so much more going on with this car. Anyone here know an e-mail I can call, the dispute resolution people are not of much help either, apparently they only care about new car buyers. If anyone from GM is read this, please help, before you loose about 10 customers, your company is struggling enough all ready, my father all ready turned in his grand prix and went to Honda.
I have been a loyal pontiac driver since I was 17, and I am now 30 and have a very bad taste in my mouth.