Car Accelerates On Its Own problems of the 2012 Hyundai Elantra

I was slowly going into my parking spot and the car suddenly accelerated and lurched forward. I tried to brake, didn't seem to do any good. It hit concrete protecting a street light and was smashed up and stopped. It was terrifying. I the car did this on it's own. I know where my feet were and I was in good shoes. I'm a classically trained professional ballet dancer and I know where my feet are in space and what they are doing. I did not accelerate, the car did it on its own like that amos episode in doctor who. It was terrifying, this car should be looked into. It happened two other times, but it did it and then stopped. This time it stopped when it hit the object. The cars I had before never did this. There is a problem with this car and I was lucky I was in a safe place.