Incorrect charges

I have been asking Vodacom to cancel a data bundle that I did not to one of my contracts since September 2022. This month I see that I am being billed again and I specifically told the agent to cancel it which they claimed they did. I called in again on the 12 December and was advised a ticket will be logged and the bundle cancelled and a refund requested. I have not gotten a call back or even a ref number. Called in again today and I am On hold for over 20 mins for a ref number.