Nightmare cancelling WEBAFRICA!

I used to have Webafrica as internet service provider. When i relocated i cancelled my subsciption and at my new adress Telkom is the service provider. Webafrica confirmed by email (no reply address) the cancelation in Jan 2023. Yet they continue to deduct off my bank account. Their service on whatsapp is shocking. i have chatted to 10 different agents already and NO ONE can help. You get transferred from one agent to another. There is no telephone line available except of course sales. Billing does not reply to any of my emails. What does one do with a Company that has such bad support?????????????????