Telkom cannot stop debit orders

I cancelled by Telkom Wireless landline in May. I followed their process and logged the query online, waited their usual amount of time before a I received a confirmation of cancellation. An then a debit order went off, and another and another. Numerous calls (half the time we cannot even get through to someone) and I am given a reference number of ********** and told that my debit order is stuck and someone from IT needs to resolve this. Got a managers details (Moses) who assured me that he had escalated my complaint. Days go by with no response and then email Moses, Lo and Behold his email mailbox is full. This is by far the worst customer service I have ever experienced.