How do i un redeem a gift card

Please follow the steps in this Apple Support article. 

If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card - Apple Support

If after reviewing the article, and following the directions in the article, you need additional assistance please follow the link below to contact official Apple Support. 

Contact Apple Gift Card Support

If you haven't spent any of the balance, click here and ask the iTunes Store staff to put it back onto the card. Otherwise, you can't.

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I would like to redeem my Apple account

Unredeem

I want to delete the account

What account?