I arrived in Germany in october 2020. My wife suggested me to get a O2 prepaid sim card. Since then, every now and then I get charge 99 cents for 30 Mb. The message I receive says this:

“Lieber O2 Kunde, Ihr Mobiltelefon hat sich mit dem Internet verbuden, deshalb haben wir für Sie die Surf-Dayflat aktiviert. Ohne Internet-Pack surfen Sie damit für nur 99 Ct. pro Kalendertag (30Mb). Diese Kosten entstehen Ihnen nur dann, wenn Sie sich mit dem Internet verbinden. Ihr O2 Team”

I haven’t used the mobile data they are claimining. Even my phone has not the mobile data active. This has happened already 7 times. I’ve been doing homeoffice since my arrival, so I almost never leave home and I don’t need mobile data as I have wifi at home. How can I unable this service??? I don’t want to keep paying 99 cts for something I’m not even using nor needing.

(Moved to our english community, o2 Michi)