Vodacom Debiting me without Approval

Hi

I am absolutely shocked with Vodacoms service. I don't have any accounts with Vodacom and I debited on the 20 November 2023 and now the 20 January 2024. When I call their customer care line, they push me to a voice bot Toby who then says my cellphone number is not a vodacom number and a link will be sent to me to port my number and the call ends immediately. This is absolutely shocking, I have not approved any Vodacom Debicheck mandate and I am being charged. Is that even legal? I'm extremely frustrated and now have to go into a Vodacom store to sort out my issues.