Dstv incorrectly billing me for Netflix account that no longer exist

Dtsv has been billing me for Neflix subscription for the past 3 months and when i call them to cancel they tell me that i need to cancel it myself on Nexflix website. The account no longer exist on Netflix as it was canceled 4 months ago but Dstv customer care agents seem not interested into helping because I've been calling and texting them via Facebook and their responses sre always different.

I've already lost R600 now from being billed for Netflix subscription which doesn't exist.

I even contacted Netflix agents to ask if there's any existing Netflix account linked to my dstv account and they confirmed that there's no Netflix subscription linked. They further stated that Dstv is the one that need to sort out this billing errors; but when i call Dstv they tell me different stories.