Thievery

I have been trying to cancel my contract with Telkom for over a year now, 17 October 2017 being my first attempt. Then on 29 May 2018, I followed up again and sent the first cancellation email to a lady at cancellations. Everytime I speak to Customer Services, they assure me it has been cancelled, but every month Telkom deducts money from me. The last time I spoke to someone was on 15 November 2018 and the lady checked and saw that everything was indeed cancelled on Telkom's side, but yet, they still deducted R493.40 from my account today, 16 Jan 2019. I am sick and tired of this thievery. I have reversed the money, but my bank says unless Telkom stops deducting there is nothing they can do, other than reverse the money every month. I have a reference number from my last call to Telkom on 15 Nov 2018, which I was told would be resolved in 72 hours, Ref ********** 1