Pathetic service at the end of my contract with Vodacom, now handed over

I have been a loyal client, never missed a payment throughout my entire contract with Vodacom. However, it has been quite the nightmare to have this account closed, I followed up each time to find out how many more months are remaining on my contract, once confirmed that it had been just a month I then requested to NOT continue with the CONTRACT, Vodacom consultant advised me during October that I was only able to request for cancelation the following month..a call was made in November, requesting for cancelation - ticket logged, and confirmation hereof received. I then received confirmation that my account has been converted to prepaid as of 31 December 2021, to make sure I understood correctly I gave vodacom another call, the consultant advised me that there are no further debit orders set up on my account..the very next day, Vodacom debited my account which I disputed.

Now I am receiving calls from HTN attorneys advising that I am in arrears because of non payment????? The explanation this HTN consultant gave me was that vodacom charged a cancelation fee, and therefore I now need to pay. Let me get this straight, after numerous follow up, my contract expiring, confirmation via email and telephone that my request has been attended to..a cancelation fee is charged again? Even though I was advised to request for "cancelation" when I called in multiple times? This service is truly ridiculous and I would never enter another service agreement with Vodacom!!!