Steering Column problems of the 2014 Mercedes Benz C300

I was stopped in front of my garage (waiting for the door to go up). When I lightly pressed on the gas pedal to pull in, the engine roared and the car suddenly leaped forward at a very high rate of speed, going thru my detached garage wall. The accelerator pedal stuck and I could not get the car to stop. I have pulled into this garage thousands of times and knew this was the car. Slamming on the brakes could not stop the car because it was accelerating too quickly. Hitting the brick facade of the condominium, beyond the detached garage was the only thing that stopped the car. No airbags deployed, which I thought they should have because of the impact. Even though I only traveled approximately 30 feet, the car accelerated so quickly, it totaled the car. The car is currently under recall as of November 2017, for a steering column issue, which includes improperly grounded components and the steering column clock spring being broken issue related to the airbags deploying while driving the car. I have tired several times to have the car repaired and have been told the mercedes dealership still does not have the part. Per the dealership and mercedes, I was adviced I would receive a letter when it was available. I purchased the car used and have since found out since this is the third recall on this vehicle. I believe it had to be something with either the accelerator automatically engaging. It was almost like the cruise control quicked in. Since it is under recall for the steering wheel related issue, I don't know if it affected the cruise control and caused this to happen.