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Look at your current subscriptions list and see if you really do have a student account already set up: View, change, or cancel your subscriptions - Apple Support
Look at your purchase history to see if you ever did purchase the item: See your purchase history in the App Store or iTunes Store - Apple Support
If you do have a subscription or did purchase one and you didn't actually do it yourself, see this article to ensure that someone else doesn't have access to your Apple ID or password: If you think your Apple ID has been compromised - Apple Support
Then contact Apple about the charge: Get help with an item purchased from the App Store, iTunes Store, or iBooks Store - Apple Support
Look at your current subscriptions list and see if you really do have a student account already set up: View, change, or cancel your subscriptions - Apple Support
Look at your purchase history to see if you ever did purchase the item: See your purchase history in the App Store or iTunes Store - Apple Support
If you do have a subscription or did purchase one and you didn't actually do it yourself, see this article to ensure that someone else doesn't have access to your Apple ID or password: If you think your Apple ID has been compromised - Apple Support
Then contact Apple about the charge: Get help with an item purchased from the App Store, iTunes Store, or iBooks Store - Apple Support
I'm trying to set up 3 months free iTunes
