Telkom billing me after February cancellation

So my account for my Adsl has been cancelled in February 2020 , then queried it a few times, had it escalated to billing who have now done the necessary account reversal journals however they are still billing me. Like *** do I have to do to stop being billed. You guys have used up all my credits by billing me erroneously and now it's June and I was billed again.