Hello , I’m having a problem when redeeming my iTunes gift card .. it says that “ this cod has already been redeemed “ , can you help me please ?

Hello Ali1992helmi and welcome to Apple Support Communities. It appears you are having some difficulty redeeming an Apple Gift Card.

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

"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 ID balance. Learn how to check your Apple ID balance.

If you need more help, contact Apple Support."

Cheers.