While driving slowly less than 5 MPH into parking stall the vehicle accelerated excessively while trying to brake the vehicle it continued to accelerate and jumped the curb while I was still pumping the brakes to try to get it to stop and the car finally stopped after hitting the front of the establishment building. No collision warning went off at this time as well. I checked the mats to see if they were against the accelerator pedal and they were not.