Hello Mit07,
Thank you for using Apple Support Communities.
We understand that you purchased an Apple Gift Card, when you intended to purchase an iTunes Gift Card. You would like to exchange it or get a refund. Depending on what you want to purchase, you may not need to exchange the gift card. Once the Apple Gift Card has been redeemed to your Apple ID account, you can take a look at the following support article to see what you can buy with that Apple ID balance:
What you can buy with your Apple ID balance - Apple Support
If this still doesn't meet your needs, you can contact Apple Support using the link at the bottom of that article for more assistance.
Best regards.