Mate, that some bad luck. Just take it to another shop, get some info then go back armed, maybe take you olds for some support and just tell them that thier work is simply unaceptable. To be honest if it were my car thier shop would be on fire by now! The bottom line is they have messed up twice now and you have not got what you paid for, them them you want a full refund, the work fixex or you will be seaking legal action.
DO NOT mess with the paint work yourself.