Sneaking in services to my contract I did not authorize.

Vodacom decided to add a service of 4GB Bonus Data Bundle 40% to my contract phone from Dec 2025 without my consent or my authorization. They sneak in a service and I'm being charged R140 for something I know nothing about. This is borderline ********* and doing business in bad faith. I left Vodacom 10 yrs ago and recently came back and took two contract phones and I'm already regretting.