Why does my iTunes card that I just purchased say it has already been redemed when it hasn't

Hello there, Killer14.

The following Knowledge Base article provides some practical steps for troubleshooting your issue:

Redeeming iTunes Gift Cards and content codes

http://support.apple.com/kb/ht1574

If you have an issue redeeming your code or card, see what to do:

• Try these steps to redeem codes that you can't activate or easily read.
  
• Check your settings if you can’t edit the redeem field or it appears dimmed.

If you have a billing or purchase question, see what to do:

• You might not be able to use your credit if you see a message that your credit is temporarily unavailable. You can try again later.
• You can use store credit to purchase items until the credit is gone. See how much credit you have left.
• Your iTunes account can have gift certificates, prepaid cards, allowance credits, and free song credits at the same time. Learn how your purchases are billed.
• You need a credit card to purchase an iTunes Gift online.

Thanks for reaching out to Apple Support Communities.

Cheers,

Pedro.