seat alhabra auto gerabox?

MY SEAT ALHAMBRA TDI AUTO,,,,I SENT MY CAR FOR SERVICE, THEY GAVE IT BACK TELLING ME THAT THE REVERSE IS NOT WORKIN, THEY DON'T KNOW WHY, WHEN I GAVE TO THEM UN THE MORNING I ALREADY REVERSED THE CAR OUT OF THE GARAGE, AND WHEN I PARKED THE CAR OUTSIDE THE GARAGE, I REVERSED PARKED THE CAR OUTSIDE THE GARAGE????? HELP.