Debit Order Woes

For the past 3 months, I have been trying, and wasn't successful in cancelling my Telkom Accounts debit order. It is sooooo frustrating. I've logged calls for Telkom to call me back, and I have not received one phone call, and yet Telkom wants to charge me for the debit order not going through. Come on, and you can't even cancel a debit order on any for their self service systems. How stupid is that.