Brake Sensor Problems of Buick Encore

I had just leased this car, drove less than 2 miles from home when my brakes failed. I applied brakes to stop, but the car would not stop, it slowed to 14 mph - kept moving until I slammed into truck approx 3-400' ahead of me, had plenty of room to stop. Pretensioner failed - driver seatbelt collapsed around me while locked in place the second I slammed on brake. Driver seatbelt was on passenger side - visa-versa - gm rep saw the seatbelts at my home - I showed them to him. He told me which belt belongs on which side and I told him they were on the opposite sides. He picked each up and showed me the 'r-l' on the end of the belt and the "r" was the collapsed belt. The gm rep said the 'intact' belt would have bruised the person, it did, my passenger. This can be verified by my passenger. Airbag sensor dispensed gas during same accident-airbag did not deploy. The car had over $10k damage, fixed - gm rep checked car because I continually saying the brakes and seatbelt failed to anyone at west point that would listen. After checking car he stated nothing was wrong. Different dealership diagnostic equip showed airbag was fixed but seatbelt never recalled, then the story changed that it was. The diagnostic info printout showed where I 'braked' but then no info recorded anywhere. My passengers seatbelt worked, I was thrown into steering wheel and was injured. I have been in contact with gm ceo with letters and the claims dept who tell me they can't help me. If my lease wasn't recalled and I apparently had the above issues, they should have fixed them before my receiving it. They would not even speak to my passenger, officer at accident, tow truck driver who saw the seatbelt hanging out my door at the scene. I am still being treated and only want fairness and a different car. This one has had so many little problems and oddities besides what I am discussing.

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