Barriers to cancel Discovery Credit Card

Hi I have been trying to cancel my discovery credit card since February/March. They seem to do everything in their power to make it an impossible task. This surely must conflict with regulations. The general call centre tells me there is no email address or phone number I can contact, but instead they will call me back to facilitate - this of course never happens. R95 a month for a service I never use. I even tried cancelling on the app, yet I am still being charged monthly. This must conflict with some regulation. I only had the card because of the Apple Watch benefit which expired in February. Thanks