Telkom mobile wiFi service impossible to cancel Poor poor service

I have cancelled my telkom wifi account in May 2020 via the on-line email facility. It is impossible to get hold of telkom any other way, unless you have a day or two available to spare. Since May 2020, I have been on the phone...yes holding on for ages.... and then the operator informs me they have no record and I must provide proof of cancellation. I explained that I used their own website on-line email box to cancel my wifi account which is on a month to month. I was told, I must give 30 day notice. I explained at length that I have given them more than 30 day by they continue to debit my bank account and then add a further R200 plus for RD fees. I explained that I cancelled and they cannot continue to debit my account at will. It is now the month of September and my account is still debited x 2 per month. My bank on my instruction is returning every debit telkom keeps putting through which is twice a month after the 1st debit is returned. I will never deal with telkom again. And the problem is still not resolved.