I would like to think that I would have kept my cool...until they tried to lie and cover up their screw up and say they did no damage. I would have been beyond a 10 and absolutely lost my mind.
I would be
DEMANDING new bumpers. Not fixed. Not used. Not anything but new. If you're going to be in business where you let inexperienced kids drive other people's vehicles, then be insured and prepared for what is only the inevitible. Don't back down from this!!!!!
Oh, yeah...I also agree with Jessa. Next time go get it hand washed.