general problems of the 2003 Chevrolet Impala

When accelerating to enter the freeway at about 45+ miles an hour, the car would not stop accelerating. I tried to put the car in neutral, downshift, and apply the brakes. I also at the urging of 911 staff, applied the emergency brakes. The car after roughly 5 miles of continued acceleration eventually stopped. The car was towed to the dealer we bought the car from. They promplty told us it was the fault of our floor mat. They reported that we would need to pay the $2000. 00 to replace the brakes, roters, and calipers. The head of service suggested we call our insurance company to have them pay for the damage to the brakes, etc. Dt.