NHTSA Complaint #10575260 — 2014 CHEVROLET SPARK

I PURCHASED A 2014 CHEVY SPARK ON 2-26-2014. 40 HOURS LATER THE CHECK ENGINE LIGHT CAME ON AND VEHICLE WAS STRUGGLING TO SHIFT. RETURNED TO DEALER AND THEY SAID THAT A SENSOR WAS NOT PLUGGED IN ALL THE WAY AND THE TRANSMISSION ISSUE WAS BECAUSE A NEW VEHICLE "NEEDED TO BE BROKEN IN...WHICH TAKES ABOUT 1000 MILES). SERVICE MANAGER DECIDED TO KEEP VEHICLE BECAUSE TRANSMISSION DIDN'T SEEM RIGHT. THEY KEPT VEHICLE UNTIL 3-7-2014 AND STILL DID NOT SHIFT RIGHT. HAD 4 DAYS, AND CHECK ENGINE LIGHT CAME BACK ON. RETURNED CAR TO DEALERSHIP ON 3-14-2014 AND THEY HAD VEHICLE FOR 13 DAYS BEFORE ANY CONTACT FROM THEM. CALLED ON 3-27-2014 & THEY STATED THAT THEY HAD TO CHANGE PISTONS AND OTHER ENGINE COMPONENTS AND VEHICLE WOULD NOT BE READY FOR ABOUT A WEEK. TO FURTHER MY SUSPICION, THEY WANT ME TO COME IN ON 3-28-2014 TO SIGN PAPERS TO REFINANCE VEHICLE FROM GMAC AUTO FINANCE BECAUSE THEY "FOUND A LOWER INTEREST RATE"!! AND TO FURTHER MY DISGUST WITH THIS SITUATION, THEY NEVER SENT THE PAYOFF TO MY FINANCE COMPANY OF THE VEHICLE THAT I TRADED IN AND NOW THEY HAVE ADVERSELY AFFECTED MY CREDIT. I HAVE ONLY HAD POSSESSION OF THIS VEHICLE FOR 9 DAYS IN A 30 DAY PERIOD. ANY SUGGESTIONS?? *TR