thats what happens when you go to a main dealer for servicing, over priced and incompetent monkeys straight out of 1 day mechanics course.
i would have beat the living shite out of him all over the showroom and shoved his broken locking wheel nut right up his balloon knot.
take it elsewhere mate and put a snotty letter to head office about how you were ill treated at one of their excuse of a caddy shack dealerships
Daz