3GB data

I have been a vodacom loyal customer for over 25 years (with the same number) and over the years I’ve never realy had any serious issues with Vodacom until now, I recently had an upgrade done with Vodacom and with that came a 3GB deal for 3 months and when I checked this months bill I was starting to get billed for that and I raised this with Vodacom to remove it, the guy that responded to me insisted I got sms’s that told me I was going to get billed, I never received such sms’s and on top of that he gave me a ussd code to unsubscribe, the ussd doesn’t even work, yes sometimes we forget which is why I believe service providers should come back to us with a friendly reminder, which in my case it was never done, I never received any sms as the guy claimed, can this bil for the 3gb be removed from my account immediately, as public sector employees we haven’t received any increase since 2019 therefore cannot afford such additional costs, every cent counts for now, can this be removed please