Q: I bought an iTunes card, but it will not redeem. It keeps telling me to check iTunes support

You will need to try contacting iTunes Support (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)