Cruise Control problems of the 2012 Kia Motor Sedona

Let me begin by prefacing that this is our 2nd Sedona, and we purchased both brand new. We have had this vehicle for 4 months, and it only has appx. 6000 miles on the odometer. I was driving down a residential side street I approached the a stop sign, I began depressing the brakes to slow down, and there was a car at the stop sign in front of me, waiting to turn left. As I continued to slow down with my foot still on the brake, the van's engine, out of nowhere, began to rev continuously at full throttle. My foot was still on the brake, and despite that the van began to move forward despite. I pushed my foot down as hard as I possibly could onto the brake, but the brake pedal was resisting, due to the continuous high rev of the engine. Out of desperation because I was just about to rear-end the car in front of me, I reached for the gear shift to throw the van into park, when the rev suddenly stopped, and the van lurched to a complete stop. I then threw it into park and sat in the road, shaking uncontrollably with my heart pounding. I just barely missed the car in front of me. Once I was composed, I very slowly drove home (~ 2 blocks). I verified that there was nothing on the floor which could have rolled under the accelerator pedal. The floor mat was in place, and was not turned up near the pedals. My seat was in its regular position. I was not using the cruise control (I. E. The cruise control system was 'off' at the time). My foot did not hit the gas pedal at all, it was firmly planted on the brake. My pants or shoes were also not caught on the pedal. This has never happened before. I have never experienced anything like it in my 21 years of driving & cannot imagine what would cause an event like this to happen in a brand new vehicle but we are terrified to drive it- especially with our children in it! I immediately called the dealership, and we dropped it off tonite.