I am so sorry. I would be sick! As everybody else has said, call GM directly and get a lawyer. Keep us all informed. Good luck friend! P.S. Not as serious of a story, but similar. My cousin bought a brand new WS6 Trans Am in 2002. He dropped it off for his 5,000 mile check and a tech went out joy riding in it. He came to pick it up and found 150 more miles on it, burnt rubber under the wheel wells and it stunk like cigarettes. He went off like a rocket and the dealer admitted their fault, fired the tech and gave him lifetime oil changes and state inspection for free. Again, it's not the same, but at least my cousin's dealer "manned up". Again, good luck!
MY RIDE: 2011 TRIPLE BLACK SS CONVERTIBLE (LS3)--K&N TYPHOON INTAKE, FLOWMASTER FORCE II EXHAUST, HYPERTECH MAX ENERGY 93 OCTANE TUNE, HOTCHKIS SUSPENSION, BLACKED OUT BOWTIES, GLOSS BLACK 20x9 STYLE 41 WHEELS
DAD'S RIDE: 2012 ZL1 #1866--BLACK, 6 SPEED, EXPOSED CF HOOD, POLISHED WHEELS, SUNROOF, ROTO-FAB INTAKE
"Silly Americans, taking from the rich and giving to the poor only works in fairy tales. Success is earned here!".