Hey @Hansdewulf,
That sounds a bit weird, because the Stadia Pro subscription costs around 9 Euro and not 3,99. Therefore I wonder if it's either another subscription or a game-purchase made on your account.
If you want to check out what happened, go to pay.google.com and sign in with the accounts that are using the payment method which has been charged. You can see their in "activities" the purchases that have been made and you can also see and manage your subscriptions in the tab "subscriptions and services".
- If you can find a Stadia subscription there (which would be around 9 Euro), you can cancel it with these instructions.
- If you can find a Stadia ingame purchase there, you can request a refund by follow these steps:
- If you see that the 3,99 € has been made for another Google purchase, you can request a refund as following: See this article
- If you see a charge for a digital purchase on Google Play that you didn't make, you can report the charges to the Google Play support team with this form.
If you can't find the 3,99 € in your Google Account, check with your family/friends/colleagues, basically those who could have access to your credit card if they have done the purchase on of their Google accounts. You can also check your credit card bill again, which reference is seen there? Usually the reference should tell you, for which Google product you have been charged.
Also it might be helpful if you contact your bank regarding your credit card if you feel that maybe someone does use it for doing purchases that you are not aware of.
If you still have any concerns or couldn't find an answer yet, you can also check with the Google Play team if there is anything else you can do here, because it doesn't look like a Stadia purchase here.
Hope this helps!
