Telkom still chargine me for a close account!!

I went to a Telkom store in December last year to close my Telkom account (my landline). Regardless of this they have been debiting my bank account every single month since. I got a call a week or so ago that they would remedy the situation only to wake up to a notification from my bank that Telkom are still debiting me. I need help - I don't know how else to get through to them