MTN CANCELATION OF CONTRACTS

I wrote a review last week about MTN and still emails has been sent to and through. This is the email I received today

Thank you for your email.

Please note your account has an outstanding amount of R525.34, kindly settle your account and resubmit your cancellation request.

Account was canceled end of July already but still they keep charging me and billing me and now they 1st want another payment due to their *********** handling of account. This is robbing the cradle even more, when it was MTN that did not renew contract due to debt review and now they want more money