Account reopened without permission.

I am still being debited for my 10 + 10 gig data package which was cancelled in early November 2015. The final debit order on my account was supposed to be 01 December 2015 as instructed by Telkom. I went to Telkom stores during December and their system reflected that the account had been cancelled. I have now been debited in error to the value of R299.00 on 31 December 2015. I spoke to a consultant on 1st Jan [Email Removed] that confirmed that the contract had ended but now when I called in to Billing they said it is still active. I don't understand how within 3 days the account got activated without my permission and after it was cancelled. I have had endless problems with this account and want it cancelled immediately and reimbursed for the last debit as it was supposed to be cancelled.