2008 MAZDA MAZDA5 Vehicle Speed Control Problems

I WAS DRIVING MAZDA 5 AND STOPPED FOR TRAFFIC LIGHT AS IT WAS RED. AS THE LIGHT TURNED GREEN, I MOVED MY FOOT FROM BRAKE TO ACCELERATOR PADDLE, THE CAR STARTED GOING IN REVERSE DIRECTION. I IMMEDIATELY APPLIED BRAKES, I TRIED TO ACCELERATE AGAIN AND AGAIN THE CAR WAS GOING IN REVERSE. NO I DID NOT HAVE MY CAR ON REVERSE GEAR, THE CAR WAS ON "D" DRIVE ALL THE TIME. I TURNED OFF THE CAR AND RESTARTED THE CAR AGAIN AND OUT THE CAR ON "D" AND AGAIN THE CAR WENT ON REVERSE. I TRIED THIS PROCESS AGAIN, THIS TIME ALL THE CAR DASHBOARD LIGHTS CAME ON AND CAR DID NOT START. I IMMEDIATELY CALLED 911, ON 5TH JULY (SUNDAY) AROUND 3:00PM. MY CALL DETAILS CAN BE RECEIVED. I TOWED MY CAR TO DEALERSHIP AND THEY ARE SUGGESTING ENGINE FAILURE. THE CAR CAN NO WAY HAVE ENGINE FAILURE. IF...

I WAS PULLING INTO A HOTEL PARKING LOT WHICH HAPPENED TO BE A STEEP SLOPE. I STOPPED MID WAY UP THE HILL TO SEE WHERE I NEEDED TO CHECK IN AND PARK. WHEN I TOOK MY FOOT OFF OF THE BRAKE, I STARTED ROLLING BACKWARDS. I PUSHED THE ACCELERATOR BUT NOTHING HAPPENED, MY CAR CONTINUED TO ROLL BACKWARDS. I PUSHED THE BRAKE PEDAL BUT IT WOULDN'T ALLOW ME TO PUSH IT DOWN. IT WAS STUCK. THEN MY CHECK ENGINE LIGHT CAME ON AS WELL AS MY BRAKE LIGHT. AS I REACHED FOR THE EMERGENCY BRAKE MY CAR STOPPED BECAUSE I RAN INTO A LIGHT POST AND A TREE DAMAGING MY CAR. I WAS ABLE TO GET THE CAR INTO PARK AND SHUT OFF THE ENGINE. I TURNED THE CAR BACK ON AND THE LIGHTS WERE NO LONGER ON. I WAS ABLE TO DRIVE IT AND PARK IT. I ASSESSED THE...