Air Bag Not Deploy problems of the 2004 Mercury Mountaineer

My 2004 Mercury Mountaineer accelerated on it's own as I was pulling into a parking space. The vehicle made a roaring sound. My foot never left the brake pedal and I could not stop it. I jumped the curb, went over a grassy area, over the sidewalk and did not stop until I hit a concrete building at approximately 25-30 miles per hour. It caused significant damage to the building and to the car. Airbag did not deploy. I have had the body damage repaired and my auto insurance has paid over $3,000 for that. My husband took it to our nearest Ford dealer where they ran a diagnostic and it showed an electronic malfunction. They said the throttle body assembly needs replacing. The technician did not give us a print-out and said he couldn't find it when we checked back later. We contacted Ford motor company to see if they would pay for the replacement because our insurance would not. They also will not pay for it, but sent us to another Ford dealer to run a diagnostic on the airbags. After explaining my ordeal to the technician, he agreed to also check the throttle body. He said their diagnostic test shows no problems with the airbag or the throttle body! he also stated that the first dealer could have wiped it from the memory of the computer. After my husband spoke with a customer service rep at Ford motor company today, she said she would request that the dealer who ran the first diagnostic test send us a copy of the print-out that he couldn't find for us. The car is going back into the shop tomorrow at a local private mechanic (not a Ford dealer technician) and we will take it from there. As of today, nothing has been repaired other than the body damage.

On January 01, 2004, while driving 25-30 mph over icy roads the consumer lost control of the vehicle. The vehicle flipped over twice yet the air bags did not deploy at any time. Please provide any additional information.