Poor MTN customer support.

I have closed my MTN account over six months ago. I have left SA and every month without fail, I receive a statement and it is now well over R4000.00. Every month I email *** asking what I can do as I am not in SA and I have closed the account and I need assistance with next steps. Up to today I have not received an e-mail or call requesting information or assistance as to how I can go about getting the issue sorted. I have sent an email every month, I had to pay an early closure penalty on the account but yet the account is still active. I am not sure who else I can complain to as I need to get it sorted as soon as possible. If I could give no stars I would. I have been a loyal MTN customer for the past 20 years, and to be treated in this way is very unprofessional.