Why was I charged 69,99€ on my Apple Account?

first see if you can recognise the charge:

1. To see your purchase history, go to reportaproblem.apple.com.
2. Sign in with your Apple Account to see a list of purchases.
3. If you want to see family members' purchases, select the Apple Account button and choose a family member.
4. To see the full receipt, including tax, tap or click the date. Multiple purchases, including subscriptions, might be grouped onto one charge.

If the charge is for a subscription that you no longer want, you can cancel the subscription. You can also view your Purchase History on your device.

If you checked reportaproblem.apple.com and your emailed receipts and you're still not sure why you were charged, contact Apple Support.

Hello!

Please see this User Tip for some next steps: Billed, but you didn’t buy? - Apple Community

Have a great day!