2 months w/out phone

Bought an iphone, after 4 months (presumably earlier due to it being in a casing so it wasn't noticeable) the phone starting bending in the middle, took phone in at MTN repair shop, couldn't work on my phone for a month due to discommunication between me and mtn and when I miss their calls and try to call back I wait up to 20 minutes just to be redirected on your customer careline. After all this struggle it came down to that I must pay R3300+ for repairs, not providing me the reason why this phone starting bending in the middle after I barely had the phone. Mtn has just gone quiet now and I can't spend another R1000 (no jokes) on mtn phone calls, I've sent an email, no reply! Mtn is giving me the worst service, I'm gobsmacked and have no idea what to do anymore, I even called the mtn store where I bought the phone and they were eager to help but they never came back to me! On 8 March, you will be having my iphone for 2 months now! I need to pay for a phone I didn't even use for 2 months. Mtn please take the phone and cancel my contract cos this situation in sickening and I would rather depart ways than to go through mtn's incompetence until this contract ends.