1999 LEXUS GS Engine Problems

IN THE PROCESS OF MAKING A U-TURN ON A PRIVATE NARROW STREET THE AUTOMOBILE RPM JUMPED FROM AN ALMOST IDLE CONDITION TO OVER 3000 RPM. EVERY EFFORT TO BRAKE THE CAR AND SHIFT TO NEUTRAL PROVED INEFFECTIVE WITHIN THE DISTANCE OF APPROXIMATELY 30 FEET. THE AUTOMOBILE JUMPED THE CURB AND STRUCK A LOW GARDEN WALL FORCING AN ENGINE STOP. THE AIRBAGS FAILED TO DEPLOY. MY ESTIMATE OF THE SPEED WHEN STRIKING THE WALL WAS 30 TO 35 MPH. I HAVE PICTURES WHICH SHOW THE BRAKE STREAKS AS WELL AS TOTAL DAMAGE SCENE. IN ADDITION A NEXT DOOR NEIGHBOR HEARD THE ENTIRE SEQUENCE OF EVENTS AND CAN VERIFY THE EXTENT OF THE BRAKING EFFORT. TO DATE LEXUS HAS STATED THAT IT WAS NOT AN AUTOMOBILE DEFECT. I AM LOOKING INTO APPROPRIATE LEGAL ACTION. THE 1999 GS300 IS IDENTIFIED AS A CANDIDATE FOR UNCONTROLLED ACCELERATIONS IN THE RECENTLY COMPLETE TOYOTA UNCONTROLLED ACCELERATION...