New Aircon installed never worked

I ordered and paid in full (equipment and installation) for a new aircon on 12 Oct 2015. Installation was done however equipment never worked. It was reported to Mr. Naidoo immediately. He stated that it would be sorted out immediately, this never happened. There were appointments made but never kept. I contacted the installer directly on instruction of Mr. Naidoo after he again did not pitch up to resolve the issue, he was totally unaware of any problem. He came out and said that the unit was leaking gas and that I had to pay R900 for the regas of the unit, I refused. He then reduced the price to R450. I still refused to pay as this is a new unit which has never worked. He then said he fixed the problem and left, however the unit still didn't work. I contacted Mr. Naidoo again and again the promises carried on. After no action I contacted Samsung directly and they immediately send a technician to see what the problem was, they found the unit was leaking gas (bad installation) and also a problem with a valve. They met with Mr. Naidoo to discuss this and informed me that Coolair will have the unit repaired the next day. This never happened and to date this unit is still faulty