I purchased an iTunes card but all the numbers wasn't there
I purchased an iTunes card with missing numbers but the store I purchased it from couldn't refund because it was activated
iPad (3rd gen) Wi-Fi
You will need to try contacting iTunes Support (we are fellow users on here), and you will probably need to give them images of the front and back of the card, and possibly its receipt : 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