I think the mechanic is cutting someone short. Trying to get paid for something he did not do. Hope it works out talking to the service manager. Take it to a local tire shop for second opinion. Speak nothing of "repairs" done. Get estimate with trouble and take it to dealer and check for current BBB (Better Business Bureau). Question their credibility if need be!! Wish Ya Best!!
you can always follow the service manager and mechanic around in your patrol car.
PULL THEIR AZZ FOR ANYTHING!!