Vodacom fails to cancel contract and *****s money from my bank account

I had a contract with vodacom which ended in October 2023, I decided to continue with a month a month and then on 03 November 2023 at 12:14 pm from my number to give then a 20 day notice to cancel the services. They failed to cancel initiate this and on the 28 November they debited money from my account for December data. I called to find out why this happened I called at 08:25 am. The lady told me she is doing me a favour by initiating a cancellation and that they can't see in any incoming call from me from 03/11/2023. The lady also told me they don't hav 20 day notice but 30 days and I asked her to email this she said I must take her word for it , So I asked her last time I took someone's word for it they failed to initiate the cancellation. She also told me my credit score will be messed up because why I reversed it and I told her I gave a 20 day notice and you people failed to get me off your systems, She said you pay your contract in arrears that's why they taking my money for service that I will not receive. They basically stole my money and threatened me with a bad credit score. I genuinely am porting my number, times are tough and we have multimillion companies *****ing from us and informing us things that don't exist especially in the consumer act. a month to month contract needs a 20 day notice , not 30 days. You can debt my money for a service I will not receive.