incorrect gift card balance

I bought a $15.00 gift card for my son me hand to the bottom of the iPad. (I didn't link a credit card to it)  The balance is listed at $4.21.  Nothing has been purchased since I bought the gift card to their account.  I checked the purchase history in iTunes and the app store.  Can someone tell me.  Is there a set of cool that I don't know?

You can contact iTunes billing support here

https://www.Apple.com/support/iTunes/account/

Tags: iTunes

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