Cancellation of Landline

On the 26 Septeember 2015 I provided notice to telkom for the cancellation of my landline. I signed all necessary documentation and was advised that the line will be disconnected within the month. All amounts due, owing and payable were paid in lieu of the account closing. I am now abroad and required the line to be closed. Despite me following procedures the account remains open and I am being billled. Would someone from Telkom please contact me as a matter of urgency.