Poor service

My contract phone stopped working & sent it for repairs @MTN Northgate. After 6-8 weeks of back & forth with the repair centre was told that the phone needs to be replaced at the branch where I signed the contract. MTN Sunninghill still cannot issue a replacement phone now a week later since I contacted them! Its now been 3 months since I took the phone for repairs & I still dont have a phone!! If the phone cannot be replaced then CANCEL the contract!! - I dont see why I need to pay extra on my contract amount for something that is not my fault!!