Contract cancelation with MTN a hussle.

I have a contract with MTN. August was my last debit month. It was either I take a new contract or cancel. I have tried calling them since the 28th of August trying to cancel. I have written emails but still I have not received any help. Had it been an upgrade they would have long assisted but because I am canceling I get moved from pillar to post. Is this how they keep people? This is really annoying. I don't require their services any longer. That's really not too much to ask.