Air Bag Not Deploy problems of the 2012 Chevrolet Silverado

Recently I was involved in an accident that was a direct impact. At the time of this accident the seat belt did not lock nor did the air bags deploy. The speed from this accident was between 50-55 mph on the highway. At the rate of speed I was going before the accident and the fact that I had to slam on the breaks to begin slowing down one would have thought the seat belt would have locked but it did not and at the point of impact I was very surprised that the airbags did not deploy but yet the system indicated that it did and needed to be reset. However now that the vehicle is in process of being repaired I am being told that the entire airbag system has to be replaced along with the driver seat belt.