Subcription fees deducted on a cancelled contract

Went 2 Telkom at Greenacres to cancel my Telkom subscription and completed the forms after I was in cue for over 3 hours. The lady was helpful and faxed and emailed my cancelation form to Headoffice to do the cancelation. Case no ***1. I was contacted a few times to try and convince me to continue but I told them I was not interested.Telkom has no reception at my work and that is where I needed the Wifi. I now have an account I have to pay for them deducting debit order still every month from my bank so I have those bounced banking fees to pay and who pays me back? Telkom wants R749 according to sms for the past 3 months but they dont phone me to tell me either that I am in arrears as I cant be if I cancelled the contract. When I phone Telkom they pick up I cancelled and say I can reverse the money they deducted but they take it again. Takes over 30min a time to speak to someone. So the right hand does not know what the left hand is doing. Phoned again yesterday ref no ***5 and they keep saying they going to email it again directly to the person who deals with the cancelations. I am gonna be blacklisted for telkom incompetance. Call centre friendly but nothing is done after