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If it shows as a payment on the iTunes account's purchase history and isn't just a : About payment card authorization holds from the App Store or iTunes Store - Apple Support
contact iTunes Support : http://www.apple.com/support/itunes/ww (click on your country's flag, the country where you live, and which is therefore the country on the account ; click on Contact Support towards the top right ; click on Get Help under 'Talk To Us’)