2002 LAND ROVER RANGE ROVER Power Trainautomatic Transmission Problems

WHILE DRIVING ON I-75 THE VEHICLE WOULD NOT ACCELERATE AND SHIFT GEARS. IT STARTED STALLING AND WOULD DO THE SAME THING AFTER THE ENGINE WAS TURNED OFF AND ON AGAIN. WE DROVE 50-55 MPH ON A HIGHWAY WITH 18 WHEELERS CAREENING AROUND US. TOOK THE VEHICLE TO THE DEALERSHIP, WE WERE TOLD THAT IT NEEDED A NEW TRANSMISSION. NO EXPLANATION WAS GIVEN AS TO WHY WITH A VEHICLE BARELY 5 YEARS OLD AND ONLY HAD 42,000 MILES ACCRUED. WE TOOK IT TO A PRIVATE TRANSMISSION SHOP AND THEY FOUND THE DEFECT. THERE WAS A CRACK ON THE REVERSE PISTON WHICH LAND ROVER WAS APPARENTLY AWARE OF BECAUSE AN UPDATED PISTON WAS MANUFACTURED. ALL WE WOULD LIKE WAS A REFUND FOR THE REPAIRS DONE BUT WE WERE TOLD NO BECAUSE WE DIDN'T GO TO THE DEALERSHIP. IF IT WEREN'T FOR THE PRIVATE SHOP, WE WOULDN'T HAVE KNOWN ABOUT THE DEFECT IN...