Telkom just drags their feet with cancelling showmax subscription

Cancelling showmax with Telkom is like talking to the wall, except the wall at least pays attention. I have been billed for 2 separate subscription on my telkom account, where Telkom states in their own terms and conditions, that only one subscription is allowed. I have sent through a request to have this extra subscription refunded as well as my subscription cancelled completely. It is now April and as at March, I was once again billed for my Showmax subscription, that God the second no longer appears, but hey my refund?. Anyway, would I have to withhold account payment until Telkom sorts this out as I am expected to meet my obligations but Telkom just does not bring their part on this one. Btw, my Feb bill included both subscriptions with a request logged on 02 March 2018. Please do not even think of subscribing through Telkom. I refuse to pay another sent towards a showmax subscription with should have been cancelled.