MTN cartel behaviour.

I did not want to give them 1 star. They don't even deserve that. MTN are intentionally harassing thousands of clients that used to have data contracts, before fiber became available. The 2-year data contracts come to an end, and they keep on billing. Notwithstanding the fact that I wrote to their customer call center or customer services or visited their walk-in call centers to "stop" that contract. I have numerous e-mails and recorded calls with the customer care to support me cancelling the contract. They are faceless and *********** and now I am pestered 5 times a day by some credit company calling and when I answer, they terminate the call. Is there NO law or recourse to this behavior in this country or does the powers that be don't care. I even asked them for a statement, to see if there is any possibility that I was in arrears, but alas. ICASA and ombud for mobile operators as pathetic.