How do I know who redeemed my iTunes card

Try signing out of your Apple ID and then back in again in case the balance has been applied to your account but isn't showing correctly.

If you bought an iTunes gift card voucher which you cannot redeem then you should first try If you can't redeem your App Store & iTunes Gift Card, Apple Music Gift Card, or content code - Apple Support in case you are either entering the code incorrectly, or the card wasn't activated. For activation issues seek redress from the vendor.

I have the card physical card I sent it to someone the person redeemed it and is claiming that the card is bad from iTunes office so please tell me the time the was used please this is always happening

If you have sent the card details to someone else as a form of remote payment, or have bought a card that has already been redeemed, then you have been scammed. See iTunes Gift Card Scams - Official Apple Support for more information.

You've fallen for this more than once? 😮

tt2

Unfortunately you can't know at what time, date or whatever it was redeemed. You have to be careful with your iTunes code. Did you have an online code? Or a physical card? Never show off your screen when your code is open somewhere, or keep your iTunes card in a safe place. Try to redeem your code as soon as possible. That's the only thing you can do in the future. For now, there's nothing you can do.

There is no way to tell what AppleID redeemed a specific iTunes card.