stop automatic payment

I have a big problem in closing an automatic payment with Telkom. After months, I required Standard Bank to block that specific auomatic payment from my bank account, and I showed all my emails and forms sent to Telkom to close the subscription. The answer received is that Standard Bank can't close an automatic payment, even if required by the owner of the account. It looks like that my only solution to avoid to continue paying Telkom is to close my Standard Bank account! It's insane!