Beware of Vodacom fiber cancellation

I feel like I'm being ****med by Vodacom. I have cancelled my Vodacom fiber mid November 2024 and was told the last payment will be in December 2024 and the fiber connection would end end of December. Well 2025 Jan I get billed the full amount again. So I phone the fiber department and the consultant told me that they charge in Jan for December which I call bull**** as no one in South Africa does business like this..unless I'm missing something. For the second month I'm paying for two ISPs.So they charged me for a full month without service how can that be legit. Cancel in November and get billed twice just beware..