I recommend reaching out to our iTunes Store support directly.
How to report an issue with your iTunes Store, App Store, Mac App Store, or iBookstore purchase
All the best,
Why is iTunes charging my credit card instead of taking it from my credit? It clearly shows at the bottom of the screen in the App Store I have $20 left on my credit from my iTunes card and the STILL take it from my credit card???
Hello Greyson's Mom,
Were you by any chance purchasing a gift card? If so, it can only be purchased with a credit card. Gift cards cannot be purchased with an existing balance.