Find out if the charge was for a recent purchase or group of purchases
Don’t recognize the amount? Sometimes multiple items, including subscriptions, in-app purchases, or items that you pre-ordered, are grouped together on one bill.
Find out if the charge was for a subscription that renewed
When you look at the list of all your purchases, look for subscriptions that automatically renewed.
If you no longer want the subscription, you can cancel it.
Check if a family member made a purchase
Do you share your device or share a payment method with your family? Ask family members if they signed up for a subscription or bought something from the App Store or iTunes Store. Or check the purchase history of each Apple ID that uses your payment method.
If young children have access to your device, you might want to set up your password preferences so that a password is required for every purchase. You can also use Screen Time to prevent purchases. Or to manage what kids buy on their own devices, set up Family Sharing.
Anyone who has your Apple ID password can make charges to your account. If you have unauthorized charges, change your Apple ID password.
Contact iTunes.com/bill Support
If you followed the steps above and you didn’t find out why you were charged, contact Apple.com/bill