MTN IS NOT CANCELLING MY CONTRACT!!!

I have a contract with MTN on 2 cellphones - *** / ***.<br> My contract ended end of March 2015. I phoned in and was informed that as it was already after the 20th they would not be able to cancel the contract as it should be before then. On the 10th of April 2015 I phoned again and spoke to Selele with *** she said to rather phone and cancel before the 20th? I then tried to phone them from the 15th to the 18th without success. I got through on the 20th and spoke to Alroy *** and was informed he will send through the request to cancel - I told him I'm not going to pay the money if they credit the phones again. He then informed me that as the call is recorded that I will not be held responsible for the money as I was unable to cancel the contract. Since then I have tried to contact them again but I'm holding on till the phone cuts off. I dont have money to phone them constantly. And again this month they put credit the cellphones? I did not pay yet they still give the money on the phone. I responded on the statement to say I cancelled without success. So what should I do to cancel this contract? I gave the simcards to other people, so ??