Telkom contract cancellation challenges

I cancelled my Telkom contract within 7 days as per terms and conditions if you cancel within a month it takes up to 2 months for the billing process to be completed. I cancelled my contract on the 26 May 2020, see below message from Telkom and still today my account is still debited monthly. I have been calling Telkom to ask what's the delay for collection and i have always told is the collection department that is holding up the matter. Operators always tell me they will log a call for collection, every time I call is the same reason. I asked the Operator to me give me her e-mail address so that she can follow up with collection department, till to date I haven’t heard anything from her. They do not give feedback but every month I get a statement/invoice and debited. Telkom operators have tendency of ignoring or not responding to the matters reported. You call them and hold for an hour before you get answered, then told is the wrong number you called. This is a frustrating service provider with poor customer service. Please help me sort out this matter as Telkom is ripping me my hard earned money, I do not use the device, is still packaged and all they need to do is to collect the device and refund me my money as per 30 days’ mandatory notice period required on all service cancellations