I have a contract with mtn, sumsung s4mini n tap

I took out a contract with mtn 2014 June, sumsung s4mini n a tablet that is forever froven. I took it to Soshanguve crossing mall at mtn shop to report it. The consultants never show interest in helping me. It was on the 30-01-2015 I keep on checking if my tablet is back I never get a definite answer, they dont seem to care nor to even go an extra mile of finding out how far. I refused to pay an amount of R1300.00 that was charged by the repairers and I asked that they send it back to me. I have been to the shop more than 5times they dont even care to<br> follow it up. Today They told me that I need to Pay R320.00 in order for it to be delivered to their shop. I find all this frustrating because I am still paying my monthly instalments and the treatment that I am getting is really bad. At the moment I will be happy if I can get my tablet back I will see to it on how i fix it and settle and cancel my contract with mtn.