In iTunes click your name or the account settings top left
This will take you to the Store at your Account info
Scroll to the bottom and select Help > Support.
This will take you here http://www.apple.com/uk/support/itunes/
Use the bottom item in the menu "Contact Support"
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
iMac 2.5Ghz 5i 2011 (Lion 10.7.2)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images." No, Seriously