VEHICLE'S DIFFERENTIAL WENT OUT RESULTING IN ACCIDENT.*MR THE MECHANIC REPLACED THE DEFECTIVE DIFFERENTIAL WITH A USED ONE BECAUSE OF THE AGE AND MILEAGE ON THE VEHICLE. THE CONSUMER CALLED AUDI AND GAVE THEM THE VIN AND OTHER INFORMATION. HE WAS THEN INFORMED THAT THERE WAS NO RECALL FOR HIS VEHICLE. CONSUMER FELT THIS WAS INCOMPETENT OR THEY LIED. *PH