Telkom won't cancel contract even upon agreed end date

I ordered the huawei router march 2018 deal, and by the way they only delivered after a while, I have emails sent to them even requesting terms of agreement which they never sent back. Upon the end of my contract I called to cancel, but to my surprise the next month my account was debited, I Called as always and informed them about the issue. But they never solve anything, they just inform you ticket has been logged and we will keep in touch. Months went by and I wasn't even using the router but they still debited my account, calls with no assistance. That time I'm wasting my time over a mere R140 monthly contract, how petty. But then the main issue here is that all the R140 they charge every month eventually adds up to a huge amount. I decided to one day block the debit order and I think I managed to only reverse 3 months worth of debit orders. I can't recall. Months and years went by and I never heard from them until recently I got a call from debt collectors demanding that I pay 2k mind you I mentioned earlier that this had a monthly premium of R140. I will not be bul**** by telkom and their *********** staff. I do not owe them intact they owe me for all the ups and downs and my time. I regret joining Telkom even if they had an unlimited data at R1 I wouldn't even be interested. I advise all South Africans when you see what seems to be a nice deal from Telkom RUN RUN. It's all nice until you have to leave. Then you'll see