Installation failure

My husband hired Jan to install a new Paradox alarm key pad. He recommended a specific type & we trusted that he knew what he was doing- big mistake. He was unable to install the recommended key pad and left us for 2 1/2 days without an alarm linked to our security company so should anything have happened, God forbid, in that time we had no way of ensuring assistance. When he came back he again could not install the key pad & again said he would try again after the entire weekend rendering us without an alarm for a further 3 days. At this point I told him it is unacceptable especially in a country like SA with the crime stats we have & said I would prefer he refunded us for non service & we would find another installer. I am shocked at his nonchalance & irresponsibility at recommending a product he can't install & that no one at Paradox seems to know how to assist with. This is unacceptable & I am shocked he is actually offended that we are using another installer & hope before he recommends any other products he is fully knowledgeable & able to actually provide the service and support he quotes and is paid for. He did offer a full refund and I hope he honors this offer.