Front Seat Belt Webbing problems of the 2001 GMC Sierra

Consumer states that the passenger side seat belts locking mechanism frequently locks the belt in a retracted or partially retracted position, the dealer replaced the belt, however it stilled operated the same, the dealer states that the belt was intended to secure a child seat, therefore being more sensitive to deceleration that the drivers belt, while in motion, the belt becomes so short and is uncomforting to the passenger.