I don't want him back tbh but will allow him to visit Tuesday to sort out his mess. If he can't get it right first time I'm not sure how he will 2nd time round.I think the legal position is that you cannot refuse to pay him, but must give him the opportunity to rectify the problems then sue him through small claims court for damages ( presumably new doors & fitting) if you are still not happy. That is how it used to be anyway but perhaps things have changed lately. You at least need to give him the opportunity to explain how he is going to give you satisfaction.
I'm going to ring citizens advice tomorrow to see where we stand. The information on their website talks about getting money back from a tradesman but we haven't paid him anything and we bought the doors ourselves