Hi apsudad,
If you are having issues redeeming your gift card, the following article will help:
iTunes Store: Invalid, inactive, or illegible codes
http://support.apple.com/kb/TS1292
If you're still unable to redeem your code after verifying the characters in the code, you'll need to contact iTunes Store Support for help. You'll need to provide a digital image of the front and back of the gift card as well as the sales receipt for the purchase of the gift card.
- Go to the iTunes support page and select your iTunes country.
- From the iTunes support page, choose Contact Support on the lower-left side of the page.
- Follow the instructions to get iTunes Store support assistance.
I hope this information helps ....
Have a great day!
- Judy