I've got iTunes Gift Card when charging gives the message (The gift certificate or prepaid card code you entered has not been properly... you get a message iTunes Store: Invalid, inactive (not activated), or illegible codes.).
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If you are trying to redeem the card onto your account and you are getting a message that it hasn't been activated then is the store that you bought it from close by so that you could try asking them to activate it properly ? If not then you will need to try contacting iTunes Support (we are fellow users here on these 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)
Card iTunes
