DSTV BILLING

I have been a DSTV customer for years. My customer number is ***0. In August DStv tells me my bill is R2031. They tell me that I joined Netflix. How can I join without receiving a notification, sms or email to confirm that I joined. I phoned them to cancel Netflix, now they say they can't join or delete membership. So how the **** can they bill me for something i am not using. I phoned again now to make sure that they deactivated it on the 25th when I phoned, they telling me it is still active. So for 3 months i am paying for something I did not subscribe to and not using at all.