Poor customer service

Customer service consultants not willing to assist in any way. I settled my contract on the day the settlement amount was provided and was informed 2 weeks thereafter that the contract and line has been cancelled as requested. I then requested confirmation of cancellation and that I won't be debited further only to find a month and a half later I am being debit by MTN. I immediately called MTN customer care whereby she informed she "doesn't know why I was debited" and this is when I requested a complaints email address. Awaiting a response from MTN and refund.