Contract Cancellation

I have been trying to cancel my contract for the last 2 months and it has still not been cancelled. I have tried going to the stores, phoning the call center,& sent emails to the customer care email and still, nothing has been done. This is the 3rd month now I have been charged for this contract. If I could give a lower rating I would. Stay far from MTN and their contracts its easy to sign up and upgrade but they hold you hostage when trying to cancel the contract.