I have a charge on my account I don't think belong to me
I need to know about a charge on my account, where can I call
You've checked the purchase history on your account (Store > View My Account, Store > View My Apple ID on iTunes 11, menu option on your computer's iTunes), and have you made any in-app purchases or have any auto-renewing subscriptions ? If not then you can contact iTunes support via email via this page (I'm not aware of any phone support for iTunes) : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page, then Purchases, Billing & Redemption