I feel for you man...i just had mine done, i did the removal and fitting myself thank god!!
They should be totally accountable for their incompetence!!!
I would want a new set of wheels and anything else they have damaged replaced F.O.C., they would be getting off lightly with that... local trading standards officer will be a help to you if they do not come good.
Good luck.
Just a quick note if it had spacers for the wheels did they fit them back in after...i had a aftermarket wheel come loose before because the dumb git i bought it off had left it off??