Vodacom illtreating and milking it's customers.

I was with Vodacom for 19 years but their treatment towards me is dispeacable totally uncalled for, I had two contracts with them, one expired in September 2022 which is 24 months, now they expect me to pay another month because I canceled on 12 October 2022 which is today. I told them I won't pay because my contract with them has expired but they just told me after 24 months it's month to month but I haven't signed anything like that. Please intervene.