Disgusting admin, debit orders *******ly deducted

I have been trying to get my data contract cancelled since Sept 2020, the expiry date was 31 Oct 2020. My phone calls to their cancellation number *** were on 3 Sept & 30 Sept, The final debit order was due on 1 Nov for 31 Oct. However ******* debit orders have been deducted on 1 Dec, 31 Dec, 26 Jan, 26 Feb & 31 Mar (5 months after cancellation). Staff at Vodacom assure me there is no email address I can correspond through. I have phoned them on 4 Jan 2021, 15 Jan, 1 Mar & 1 Apr. I have also hand-delivered a letter to a local Vodacom branch on 1 Feb, with all the dates, call times (from my cell phone call log) & contact names. Each time I have been assured that I will be contacted within a few days and that all money withdrawn after 1 Nov will be refunded. To date I have heard nothing from Vodacom & no money has been refunded. As a pensioner I cannot afford to see a lawyer, but I have threatened to lay a charge of ***** with the Police. Still no contact from Vodacom.