Theft of my money by Telkom

I have cancelled my LTE services on 19.08.2017 and received confirmation of cancellation on 19.08.2017 from Telkom. Yet I am still being debited on a monthly basis now 7 months later. I have sent various emails to them. Every time the Telkom recipient promises that it will be actioned and that my account will be credited. Yet nothing happens and I cannot stop the debit order from my sides. Telkom employees that have spoken to and also emailed again all relevant documentation are Ashraf Rossouw on 07.10.2017; also to Linda Luli (MDLuli) on 08.01.2018 and again to Rameez Jattim 0n 01.03.2018. I simply cannot get this service cancelled or m,y money returned.