1997 Buick Lesabre seat belts problems

I was rear ended while stopped at a red light and then pushed into the car stopped in front of me and transported to emergency room. The safety belt on my 1997 buick lesabre ltd did not hold me back during the collision and I was thrown face first into my steering wheel. This resulted in a severely broken nose, severe facial contusions and bruises. I am told by buick dealer repair personnel that a buick lesabre must be traveling at 25 MPH in order for seat belts to lock and hold the driver back.

Tl* the contact owned a 1997 buick lesabre. While driving approximately 50 MPH, the contact crashed into another vehicle and the rear driver side seat belt webbing tightened independently around the child's body. The occupant sustained a fractured back and torn spine. In addition, there was injury to the abdomen. The injuries required medical attention. A police report was filed. The vehicle was destroyed and towed to the dealer. The manufacturer was notified of the failure.