MTN HAS THE MOST PATHETIC SERVICE

I took out a contract with mtn and 3 months later the phone was faulty. I took it in for repairs waited 2 weeks for them to tell me that the phone is faulty and due to it being under 6 months i would recieve a new handset.. they did not have stock of the handset and so i was told to wait.. it has since been 3 months without recieving a handset back for a contract which i am paying for and is up to date..i am paying for something i do not havr.. i have tried everything possible even the regional manager is of no use .. how is possible to not have stock when the handset is advertised in the catalog, its like a garage without petrol .. this is the worst customer service i have recieved my whole life