Auto repair service near Piscataway, NJ

bought a 2005 hummer 2 sut with 48,xxx miles,,very beautiful vehicle,,very nice people that work there also bought an extended warranty,,about it 07/11/2011.....took vehicle for first service at 50000 miles,,,,brakes,,were "metal on metal contact" not a major problem guess, the mechanic says " left cylinder head has broken bolt in back of manifild" apprently it was convered under the extended warranty, until it was time to honor the warranty, Contacted Automotive avenues, a few times, spoke to steve last and i asked if we can come to some kind of ground to fix this problem,,,i ased if i should contact a lawer or better business ,,and that was the last i heard,,,,i was told that this vehicle should never have been sold like this,,,,great people until, something goes wrong,,,,beware