Vodacom Bullying Tactic: Listing to make me pay after contract ended.

I had a contract from 2018 to 2020. Just before the contract ended I emailed and called Vodacom to end my contract and to not make the contract a month to month contract. I got the contract for the phone and never used the Vodacom sim card. Vodacom started to bill be for a few months as a month to month client from August 2020 until end December 2020. I was contacted since then by their debt collection companies who I shared my correspondence to. My bill is only R981 but now I have been listed as a defaulter. Vodacom you did not have my consent to change my contract into a month to month contract. Your cancellation department assured me the billing will be cancelled but instead you lodged a judgment against my name. This is **************** attempt and just pure bullying tactics to get money that you are not entitled to. Please contact me to sort this matter out as you are too quick to take my business yet don't bother taking care of me as a client when I want to end the contract. I have all the email correspondence as proof and also you can search for my many calls since August 2020 confirming my cancellation of my contract. I need this listing removed failing which I will take this to court as you have no legal grounds to bill me after I instructed you in wrting to cancel my contract in August 2020.