Telkom keeps debiting R1599 from my account despite cancellation request in January

I cancelled my Telkom account in January by emailing my cancellation through along with a copy of my ID, as instructed by an agent at the Telkom shop. I was reassured that I could cancel at any time on a month-to-month basis. Despite this, R 1599 has been debited from my account every month! I had sent a follow up message to the email address, but I never receive any response. I have now advised my bank to cancel and reverse the debit order and am shocked at this terrible customer service!