TELKOM - CANCELLATION DEBACLE, ******* DEBIT ORDER DEDUCTION

I'm trying to extricate myself from an enormously expensive business wifi package. Since I first attempted it in early January this year, it has been one mess up after another with respect to how Telkom have handled it. Upshot was being without home wifi for just over 3 weeks because the new ISP could not connect to the fibre circuit. But worst of all, in spite of all assurances that my contract had been eventually properly closed (as of 1 February) and the debit order cancelled, Telkom have debited my account for R2000 for March, without sending any notification of this intent (i.e. no invoice.) I have exercised extreme patience and politeness to the Telkom operatives concerned in my case (I have been a regular at the Cavendish Telkom shop) but they NEVER communicate with me, and certainly this irregular (*******?) deduction should have warranted an immediate response to my email sent the very moment I saw the bank notification, but no, I still had to phone them, then go into my bank branch, wait 30 minutes to see a service consultant, reverse the debit order, pay R30 for it, and no guarantees that this won't happen again. I'm utterly powerless.