Telkom cancellation(the impossible dream)

On 1 July 2020 we have cancelled 1 of our lines and our ADSL services. The extra line got cancelled mid-August 2020. The ADSL line and the ADSL Fastest line is still running. They deduct money from us monthly. We have contacted them via e-mail and telephonically between 20 to 30 times. The same answer: it's getting escalated. A year long? We have spoken with different levels of authority. Same answers. It is simply impossible to cancel. We are looking, using our bank, to cancel and reverse charges and stop order, but it is also difficult, at a cost, no guarantee and even if unsuccessful still at a cost for each attempt. WHY IS THIS SO DIFFICULT TELKOM........and/or IMPOSSIBLE? Does your admin/accounting department still exist?