Car Accelerates On Its Own problems of the 2002 Mercedes Benz ML500

I own a 2002 Mercedes Benz Ml500. A week ago I experienced sudden acceleration while driving on an interstate. As I was accelerating the car suddenly accelerated (the gas pedal went to the floor) and I was unable to stop the car despite fully depressing the break pedal. The car reached 80+ mph and I was forced to drive off of the road to avoid an accident (I was able to slow it to about 50 mph by fully depressing the break pedal). I was finally able to stop the car by shifting into neutral (it has an automatic transmission; when I shifted to neutral the engine immediately decelerated). Over the next 40 miles I experienced sudden acceleration 10+ times. This occurred both while I was accelerating and while I was braking. While attempting to stop at a stop sign in my subdivision the car accelerated and drove through the stop sign. I parked the car in my garage and called my mb dealer. I asked to have the car towed to the dealer and I was told that they would not do this. I explained the issue to them and they seemed unconcerned. I have not driven the car again since this occurred (I will not ever drive it again).