Hi. I have not made any purchases in the appstore / itunes but it takes money from me. What is the problem?

Check and cancel your subscription. You might have accidentally subscribed to an app or a family member using your Apple ID did it.

1. Open the Settings app. 
2. Tap your name. 
3. Tap Subscriptions. (If you don't see "Subscriptions," tap "iTunes & App Store" instead. Then tap your Apple ID, tap View Apple ID, sign in, scroll down to Subscriptions, and tap Subscriptions.)
4. Tap the subscription that you want to manage.
5. Tap Cancel Subscription. If you don’t see Cancel Subscription, the subscription is already canceled and won't renew.

And then request for a refund.

1. Go to reportaproblem.apple.com. 
2. Sign in with your Apple ID and password.
3. If you see the "Report" or "Report a Problem" button next to the item that you want to request a refund for, click it.
4. Follow the instructions on the page to choose the reason why you want a refund and submit your request.

Hope this helps!