2009 Toyota Venza Seat Belts Problems

I HAVE A 3 YEARS OLD WITH 6 MONTHS CHILD. HE WAS SECURELY FASTENED USING A CAR SEAT BUT WITH THE TOYOTA VENZA BACK SEAT BELT. THE SEAT BELT WITH NO APPARENT REASON LOCKED AND MY CHILD TRY TO GET LOOSE FROM THE SEAT BELT. THE CAR WAS STOPPED WITH THE PARKING BRAKE PUSHED ALL THE WAY IN AND I TRIED TO LOOSE HIM OFF THE SEAT-BELT BUT I COULD NOT BECAUSE THE SEAT BELT GOT AROUND MY CHILD BELLY AND WAS DEPRIVING HIM OF AIR TO BREATHE. WITH NO SUCCESS AND MY SON DESPERATELY CRYING FOR HELP I HAD TO CUT THE BACK SEAT-BELT. I CALLED THE TOYOTA DEALER WHERE THE CAR WAS PURCHASED AND THEY TOLD ME THE WARRANTY DOES NOT COVER THESE INCIDENTS BECAUSE THERE IS NO RECALL OF THIS PARTICULAR ISSUE. IN MY OPINION A SEAT BELT WHICH LOCKS ITSELF AND ALMOST KILLS MY CHILD IS SUFFICIENT AS TO CHECK AND REPLACE THE SEAT BELTS. THOSE SEAT BELTS HAVE SOMETHING WRONG AND COULD MEAN A FUTURE DEATH IF NOTHING IS DONE. THESE PEOPLE ARE IGNORANT ABOUT THESE ISSUES AND WOULD NOT FILL A REPORT ABOUT THE INCIDENT, THEY WOULD ONLY ASK FOR THE $265 COST TO REPAIR THE SEAT-BELT.