Deductions against Closd Account

I've cancelled a data contract during mid 2017 however, my bank account was debit every month. On enquiry I was told it is a mistake and that the money deducted will be paid back - see Ref: ********** 85 and Ref: ********** 97. This month a deduction came through again!! On phoning customer service I was told that the credit went to another number of mine. When I told the person that I do not have any active contract number he told me according to records its ********** . I then request the agent to see when that number was used last he told me that as far as he can see there were no usage records logged for months (Ref ********** 84) and referred me to cancellations. The lady at cancellations (Majafela) told me that the account was not cancelled according to her and that she can do nothing for me - Ref: ********** 87. This is a disgrace - MTN can see that the account had no activity for months. Am I supposed to pay for no service at all???? I've cancelled a data contract during mid 2017 however, my bank account was debit every month. On enquiry I was told it is a mistake and that the money deducted will be paid back - see Ref: ********** 85 and Ref: ********** 97. This month a deduction came through again!! On phoning customer service, I was told that the credit went to another number of mine. When I told the person that I do not have any active contract number he told me according to records its ********** . I then request the agent to see when that number was used last he told me that as far as he can see there were no usage records logged for months (Ref ********** 84) and referred me to cancellations. The lady at cancellations (Majafela) told me that the account was not cancelled according to her and that she can do nothing for me - Ref: ********** 87. This is a disgrace - MTN can see that the account had no activity for months. Am I supposed to pay for no service at all????