Speed Control Cable problems of the 2015 Honda Civic

Ii had pulled out of a parking lot and was preparing to make a left turn. To allow an oncoming car to pass, I stopped in the intersection. However, the vehicle behind me was following too closely, and hit my rear bumper. Upon impact, my car suddenly revved and accelerated to perhaps 20-30 mph. I pressed harder on the brake, but the acceleration continued. I quickly applied the hand brake, and my vehicle came to a stop in the driveway of a facing business. Fortunately, no human or property damage occurred. I took my vehicle to the Honda dealer, who thoroughly inspected the applicable components; they could find no problems, so they contacted Honda, who subsequently came out but again could find no problems. The dealership suggested that I might have erroneously applied the accelerator instead of the brake, but I know that this is not true. I have many years of excellent driving experience, and quick reaction time. I am absolutely positive that I was applying the brake, and that my car experienced unintended acceleration. With a supposed clean bill of health, this car continues to be my mode of transportation. However, I always have an underlying fear that this unintended acceleration might occur again.