Cell C-horror journey part 2

So my saga with CellC continues following my previous complaint which was unanswered with bot like private replies and the only answer I got from them was to hand me over to some collection agent that added daily huge interst to what you owe. I still don't know how or why I owed them this as they don't take clients seriously. I was a client for 8 years and they didn't even feel the need to give me the courtesy of a proper engagement. None of the questions I asked were answered. The cancellation process was delayed from their side to begin with. Still don't know how they gave me a last and final payment or they wouldn't let me port away. This was paid and my number was ported to great service provider Telkom mobile. This was over a year ago. Then I find out I owe Cell C an amount from 6 months ago. How ? Anyway I decided to pay the amount to keep my sanity and at least I can then break my ties with Cell C who I will never do business with again and I tell my story to ally friends and family who ask my opinion on them of course. Anyway I still haven't heard anything back after making the payment. I'll probably get a bit answer unrelated to my questions again