Hi, I've just purchased a $50 gift card from woolworths, after putting the code into App Store while trying to redeem the voucher - it comes up stating the card has not been activated and I should contact iTunes support
You can contact iTunes Support via this link (these are user-to-user forums) : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page, then iTunes Cards And Codes (you will probably need to give them images of the front and back of the card, and possibly its receipt)