2016 BMW 328I Forward Collision Avoidance Warnings Problems

ON MARCH 22, 2021, I WAS PARKING MY 2016 BMW GRAN TURISMO 328X AT A PARKING GARAGE. II HAD COMPLETED THE INITIAL TURN-IN, WHEN THE CAR FELT LIKE THE ACCELERATOR HAD BEEN PUSHED TO THE FLOOR. THE CAR WENT FROM APPROXIMATELY 5 MILES AN HOUR TO ABOUT 20 MPH IN THE LENGTH OF A PARKING SPOT. THE CAR HIT THE CONCRETE BARRIER HEAD ON, WITH THE SIDE CURTAIN, STEERING WHEEL AND LEG AIR BAGS DEPLOYING. THE CAR WAS FULLY MAINTAINED AND SERVICED BY THE BMW DEALER WITH BRAND NEW TIRES. IT HAD ABOUT 78K MILES ON IT. THE FORWARD COLLISION WARNING DID NOT GO OFF NOR DID THE AUTOMATIC BRAKING OCCUR. I ASKED THE REPAIR FACILITY TO CHECK OUT WHY THE CAR SUDDENLY ACCELERATED, BUT WAS TOLD THAT ACCIDENTS HAPPEN AND THAT THE CAR WAS TOTALED ANYWAY. I DID NOT PRESS THE ACCELERATOR 'ACCIDENTALLY'. I HAVE HAD HUNDREDS OF HOURS...