Bad Debt!?!

I was a DSTV customer until October 2019 when I decided to cancel, as so many other South Africans have done. Yesterday (12/03/2020) I received a call from a debt collecting agency informing me that Multichoice had handed me over for an unpaid amount of R245. I was shocked as this was the first I'd ever heard of any outstanding money. No emails, sms's or phone calls were made by DSTV. Had they contacted me and given me an opportunity to pay, I'm quite certain that I would have. Is this their normal procedure and how they treat all their customers? If so then it's yet another reason why they're losing market share by the thousand...