The driver's seat belt no longer functions and the passenger's front seat belt no longer functions. the seat belt can not be buckled. when the metal belt tongue is inserted into the buckle, it will not latch. the latch seems to be jammed. the passenger's front seat belt has been jammed for approximately 6 months and today the driver's side seat belt jammed and no longer works. our family owns four similar model ford super duties and this problem has occurred on another truck also. this is a serious safely issue and appears to be a vehicle defect. we have notified ford motor company and they said no recall exists so were not willing to assist in correcting the issue. the needs to be addressed immediately. *tr