Bully Tactics and extremely unprofessional service

Our automated garage door broke and I contacted Selwyn to repair it. He asked for an immediate deposit and I paid 50% of the amount by direct transfer. We agreed he would come to repair the garage door yesterday and I told him the owner of the property would pay the balance into his account on completion. This sent Selwin into an absolute sulk and he arrived yesterday sullen and unpleasant. he completed the work and left saying that he expects payment with immediate effect, that he is unhappy with the arrangement as the landlady lives overseas etc. By late afternoon I had Selwyn leaving messages on my cell phone saying that if payment is not in his account by 6.30 pm he will personally return to the property and BREAK THE GARAGE DOOR HIMSELF. I called him back and told him that I do not appreciate being threatened and that to my knowledge he had already been paid anyway. I received another call from him this morning saying funds had not cleared yet and He promised me that I would have ''serious problems'' if he is not paid by the end of the day. He has been paid in full but this is not the point! This is no way to treat a customer Selwin is dangerous and unprofessional at best