2000 CHEVROLET PRIZM Seats Problems

I WAS INVOLVED IN AN AUTO ACCIDENT ON 9/1/2002 IN WHICH MY SEAT BACK FAILED. I WAS TRAVELING AT APPROXIMATELY 65 MPH IN MY 2000 CHEVROLET PRIZM LSI. I WAS REAR ENDED BY A HONDA CIVIC TRAVELING AT APPROXIMATELY 100 MPH. THE FORCE OF THE IMPACT WAS SUCH THAT WHEN I WAS THROWN TO THE BACK OF THE SEAT IT BROKE AND CHANGED THE POSITION OF THE ENTIRE SEAT FROM APPROXIMATELY 90 DEGREES TO 150 DEGREES. WHEN I APPLIED THE BRAKES I WAS THROWN FORWARD AND TORQUE-TWISTED AROUND THE THREE POINT HARNESS. I THEN HAD TO REGAIN CONTROL OF THE VEHICLE WHILE ALSO USING THE STEERING WHEEL AS A SUPPORT TO KEEP MYSELF UPRIGHT WHEN THE SEATBELT WANTED TO PULL ME BACK INTO THE SEAT BACK WHICH WAS NOT THERE. THE SEAT WAS SUPPOSEDLY REPAIRED; I'VE BEEN TOLD THE HARDWARE HAS BEEN REPLACED. HOWEVER, A NEW PROBLEM HAS MANIFESTED ITSELF....