I assume that means they over torqued the nuts which makes everything they touched suspect to my mind. At the very least I'd want all the studs changed and I'd want to stand there and watch them do it. They won't like that. Keep a close eye on that hub temperature. If they messed up the bearing install you'll have worse problems than just a busted stud.
Just watch Gary if they need to hammer the rest of the nuts off with a impact gun they are stretched you should be able to screw the nuts off by hand once broken loose