Telkom dishonest service

Have been trying to contact Telkom to cancel a month to month data line. The cancellations number does not get answered. Been trying there is never an answer. I left my speaker on at 40 minutes at a time but still no answer. Been trying for 3 working days now. Tried cancelling on the web and app but also have no joy. I eventually drove to the Telkom outlet in Amanzimtoti, but they couldn't help either. They couldn't even give me an email address to try and cancel. Telkom gave no way of canceling except by phoning the retentions department and they MAKE SURE you cannot get thru.