Accelerator Stuck problems of the 2004 Subaru Legacy

I was steering the car, just leaving the lot of a home improvement store. I made a right turn, drove the distance of, perhaps, a city block and moved into the left lane to make a left turn. I had to stop for a red light so I applied the brakes but the car did not want to stop. The engine began revving! the gas pedal was stuck! feeling terrified, confused, not knowing what to do, I shoved the gear into park and turned the ignition switch to off. Later, I called the dealership and was given the "floor mat excuse" that the gas pedal had stuck for that reason; I was not told to bring it in for a checkup.