An unwanted subscription for O2 Unlimited Games Premium

Cancel the option; then you won’t have to pay anything. 
https://www.o2online.de/widerrufen/ 
Also, read through this and follow the steps.

Thank you for replying.

I alreday sent an email to widerruf@cc.o2online.de

asking them to refund any cut fees made without my knowledege.

Very good. Awaiting a response.

Hello ​@MustafaDeBe,

a warm welcome to the o2 Community! 🤗

An unwanted subscription is never a pleasant surprise. It’s great to see that Bumer has already shared links to the relevant FAQs with you – thank you 🫶

I’ve looked into this for you, deactivated the subscription with immediate effect and refunded the €3.99. Is everything sorted now? 😊

Best regards 
Daniela