it says they have already been redeemed!
See this Apple article: If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card
If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card - Apple Support
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Card has already been redeemed
If you see a message that says that your card has already been redeemed, you might have already redeemed it. Sign out of the App Store or iTunes Store on all of your devices, then sign back in. This refreshes your Apple Account balance. Learn how to check your Apple Account balance.
👉 If you need more help, contact Apple Support.
Beware of -> About Gift Card Scams -> About Gift Card Scams - Official Apple Support
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Where to buy a physical Apple Gift Card or App Store & iTunes gift card? 👉 at an Apple Store or an Apple Authorized Reseller in your regio.
If you have a valid payment method on file, instead of buying or order an App Store & iTunes gift card, you can Add money to your Apple Account balance anytime, no gift card needed, see -> Apple Gift Card - Apple (UK)
If you still need help, get support from Apple directly -> Get Support or call Apple in your region see -> Contact Apple for support and service or check -> here for more support and assistance.