How can Netflix just add onto my DSTV

I asked Multichoice to get involved very recent Netflix at R199 was added to my R1127 Dstv per month and why would I add **** like that if my son already has it.

Well, No help, No feedback and today the debit went off

So, Dstv obviously have to pay Netflix

It was up to me to cancel Netflix the very next day with a comment of Sorry to see you go, but you will be charged the full amount

How is this possible,

After 30yrs plus with Mnet, dstv whatever, I hold them responsible