contract not cancelled!

i was told to email proof of payment which i have done over 2months back, and the contract is still not yet cancelled!! i havent used that sim card for months. i was told to pay the cancellation fee. which i dont think was fair is there is NO NETWORK in my area. i have logged a case several times for network issues, NOTHING was done, i even held on today for 23mins with the call center, the service is pathetic. i want nothing to do with mtn. please I urge someone to please cancel this contract and move it to prepaid so i can port out to another network. i am not prepared to pay a single cent to MTN , i did what i was told to do, i emailed the proof of payment made from mtn at maponya mall.(the amount mtn needed to cancel the contract.) Please sort this matter out as soon as possible. I am tired now, i cannot afford to run after you guys begging for something to be done about this.