2009 DODGE AVENGER Power Trainautomatic Transmission Problems

I HAVE A 2009 DODGE AVENGER THAT IS OPERATING UNSAFELY. IT CONTINUES TO MAINTAIN ITS SPEED WHEN I TAKE MY FOOT OFF OF THE ACCELERATOR, AND DOESN'T SLOW UNTIL I PRESS ON THE BRAKES! IT ALSO TO LURCHES FORWARD WHEN AUTOMATICALLY DOWNSHIFTING, CAUSING ME TO BRAKE EVEN HARDER WITH NEAR MISSES IN ALL OF THESE SITUATIONS. I INITIALLY WORKED WITH LA MESA DODGE DEALERSHIP, WHERE I PURCHASED THE CAR, BUT AFTER SEVERAL MONTHS, POOR CUST SVC AND NO RESOLUTION, I TOOK THE VEHICLE TO HINE DODGE IN MISSION VALLEY, CA. THE SERVICE MGR AND SVC ADVISORS HAVE DRIVEN THE VEHICLE. ALL VERBALLY ADMITTED THAT THEY EXPERIENCED THE SITUATIONS I DESCRIBED ABOVE. THE VEHICLE OPERATION WAS RECORDED AND SENT TO A CHRYSLER SERVICE REP, WHO REPLIED THE "VEHICLE OPERATES AS DESIGNED." ALTHOUGH THE SVC ADVISORS/MGR HAS VERBALLY DESCRIBED THEIR EXPERIENCE TO ME, THEY HAVE NOT DOCUMENTED ANYTHING ON THE SERVICE SHEET....