Cannot cancel the Service on my account

I Signed up for The Premium Streaming services, and then one day later decided I would rather activate my premium decoder again. After witch I tried multiple times to cancel the Premium service from my account, even tried to contact DSTV they only said I have to use the App to cancel witch I did, The same error occurred after days of this they debited my credit card witch R1700. The premium streaming service is still on my account and have tried all ways to cancel it, there service is just terrible. No wonder everyone is moving away from them. Wont be renewing and would probably need to remove my credit card info in order for them not to take my money again. IT's shocking