Digital gift card sent with Wrong email
Purchased iTunes gift card online thru iTunes send gift. The recipient email was incorrect.
iPhone 7, iOS 10.3.3
Assuming that the email address that you sent it to doesn't exist and it hasn't been redeemed see if you can resend it to the correct address : Resend iTunes Gifts - Apple Support
If you can't resend it (and assuming that it hasn't been redeemed) try contacting iTunes Support : http://reportaproblem.apple.com or https://www.apple.com/emea/support/itunes/contact.html