[Resolved]  Hyundai Elantra — DEFECT IN CAR

I PURCHASED A HYUNDAI ELANTRA ON 2 FEB 2007. IT HAS SOME PROBLEM AS TYRES GOT WORN IN 15000 KMS THE COMPANY COMPENSATED 50% OF NEW TYRE PRICE AFTER MANY COMPLAINTS. NOW IT IS 34000 AND TYRES ARE AGAIN WEARNG OUT. REAR SHOCKERS HAVE BEEN CHANGED TWO TIMES BY THE COMPANY. SERVICE OF THE CAR IS NOT DONE PROPERLY AT ANY OF THE DEALERSHIPS I HAVE VISITED. THE CAR WAS UNDER WARRANTY FOR TWO YEARS . COMPANY DID NOT EXTEND WARRANTY FOR ANOTHER TWO YEARS AS PROMISED ON TIME OF PURCHASE. COMPANY DOES NOT RESPOND. WHAT SHOULD I DO.