Extra view issue not attended to

I recently had an installation of an explora at home and the technician by the name Matthew Hulisani, was sent to assist us. We requested for an extra view instalation which he stated that he didn't have a diplexer but could install the extra view. We let him do his job, but 30 minutes after he left, there was a signal problem in which we let him know. I called multichoice multiple times to fix the error and was advised to contact the technician. He has been giving us the run around about coming to fix the issue but hasn't shown up for 4days. This is clearly a problem with the connection to the cables as mentioned he didn't use a diplexer as he said he could have. I'm really not pleased with his services, more especially because we paid him for the extra view cost. He was around the area but still did not bother showing up.