If you don't use an Apple device, what would you be purchasing an Apple Gift Card for? It can only be used for App Store, apple.com website, or physical Apple Store purchases. I would not expect you would get a refund /money back as it is not allowed in most regions, but none of us speak for Apple so certainly contact them again and see what they say.
- You can’t redeem or return Apple Gift Cards, App Store Gift Cards, or unused Apple Account balance for cash, except as required by law. If your jurisdiction allows for refund of redeemed gift balances, you can contact Apple Support to request a refund.
Check your Apple Account balance - Apple Support