dstv keeps billing on my dormant account

I just received a phone call from DSTV Multichoice, I used to be a subscriber, it must have been 5 years ago when I cancelled my dstv subscriptions.

A couple of years ago, my dstv subscriptions was activated without me knowing and even worst, I had to findout by debit order, and debit order I never signed up for. Which makes it *******! I managed to contact dstv and stoped the debit order being processed.

Today I received a call from their billing department saying I owe them R4000. This was a couple of years later, so I'm assuming their brilliant ops staff switched my subscriptions back on.

This is redliculous, I want to remove my self from their customer database