Telkom still billing me after cancelling account in May 2017

Cancellation form plus copy of ID was sent to the email address provided by telkom which is : ********** on the 5th of May 2017.Confirmation email from Telkom was received and stated it will take 20 working days to close the account. In November 2017 I receive a bill again from Telkom stating my account is now in arrears. I then phoned Telkom again and go told of a Telkom employee by the name of Phelma email address ********** who was suppose to resolve this issue after seding her all relevant documentation and mails from the month of May, but guess what I received a bill again for the Month of December. I have not battled for 7 months to cancel my account with Telkom. I have now lodge a complaint at the ISPA. If nothing is revolved before the end of December I will get legal advise.