Requesting a refund and deleting my Apple Account

From: How to delete your Apple Account - Apple Support

“What happens to my App Store or iTunes Store credit when I delete my account?

Any unused credit balance in your account isn't redeemable or refundable after your Apple ID has been deleted. You can either spend your balance or contact Apple Support to request a refund before deleting your account. Similarly, if you have a balance due to Apple, you must clear this balance before we can delete your account.”

Remember that the people responding on the forums do not work for Apple. We are Apple products users like yourself. You need to contact Apple itself if you wish to request a refund.

Refer to this page for Apple Support features ➔ Contact - Official Apple Support

Select from the presented options until you find a solution for your issue, or see if there is a chat or phone call contact method offered lower on the page (you sometimes have to narrow down the options multiple times before this is shown). If you do not see your issue, keep experimenting with any series of selections until you reach one that offers a chat session or a telephone call and get the representative to redirect you.

This support article has various country telephone numbers for contacting Apple for support and service ➔ Contact Apple for support and service - Apple Support

Did you redeem Apple Gift cards into the account?