2001 Ford Ranger seat belts problems

Tl*the contact owns a 2001 ford ranger. While driving 55 MPH, the vehicle slid on a patch of snow. The rear wheels lost traction and the vehicle flipped over twice before crashing into a tree. The air bags failed to deploy. The vehicle struck a tree. The driver suffered bruised ribs on the left side and a stiff neck. The passenger sustained major bruises everywhere including her back, legs, and wrists. She also sustained a severe bump on her back and minor cuts.

Driver side seat belt retracting mechanism came apart and made seat belt inoperative. I bought a new seat belt and replaced it. Replacement seat belt did same thing 9 months later. Dealer replaced it free of charge. 3 months later same thing happened again. Dealer replaced it again. 3 months later it broke again. Warranty on parts is for 1 year so I am liable to replace it. I am concerned if they are made this poorly, will I be protected in case of a collision.