Itune gift card

“You cannot redeem this certificate because it has been disabled.”

Gift cards do not need to be enabled.

That's an indication that the gift card was reported lost or stolen.

Bring it back to the shop / seller wherever you have bought it along with the receipt.

Ask your money back.

Beware of -> About Gift Card Scams -> About Gift Card Scams - Official Apple Support

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Contact Apple

If you have additional questions, or if you've been a victim of a scam involving Apple Gift Cards, App Store & iTunes Gift Cards or Apple Store Gift Cards, you can call Apple at 800-275-2273 (U.S.) and say "gift cards" when prompted, or contact Apple Support online.

More information

• FTC: Scammers Increasingly Demand Payment by Gift Card
• FTC: Scammers push people to pay with iTunes gift cards
• AARP Scam Alert: iTunes Gift Cards the Latest Go-To Tool in Many Gotchas
• IRS: IRS Warns Taxpayers of Summer Surge in Automated Phone Scam Calls; Requests for Fake Tax Payments Using iTunes Gift Cards

If you still need help, get more help and assistant from Apple directly, see Contact Apple for support and service -> Contact Apple for support and service – Apple Support (UK) 

If you are having problems redeeming a gift card, review the possible reasons and suggestions listed in this support article --> If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card - Apple Support