Cannot cancel recurring data bundle on my account

for the past year i have had an unwanted month to month Data bundle added to my Vodacom Contract . I've been into the Vodacom store as well as tried to cancel the service on my Vodacom profile both on the web and on the Vodacom App . each time i try cancel the service i get confirmation from the Call center agent and then the next month its back again. how can this service just be added to someone's account like that and when i want to cancel it they make it impossible to do so.

I've been with Vodacom for over 17 years now and i think after service like this i will be cancelling the contract once and for all . i wonder if cancelling it will even work seeing as they cant get a data bundle cancelled on my account .