Didn't receive the refund money

According to: How long refunds from the App Store or other Apple services take - Apple Support

"When will I get the money back?

If your refund is approved, the funds are applied to the same payment method that you used to buy the item. Here's how long it takes for a refund to appear on your account or statement:

Store credit—It might take up to 48 hours to see the refund in your Apple ID balance.  

Mobile phone billing—It might take up to 60 days for the statement to show the refund. Processing time might be affected by your carrier. You can contact your carrier for an update.

All other payment methods—It might take up to 30 days for the statement to show the refund. If you don't see the refund after 30 days, contact your financial institution."

If none of the previously stated delays apply:

"Store credit—It might take up to 48 hours to see the refund in your Apple ID balance.  

Mobile phone billing—It might take up to 60 days for the statement to show the refund. Processing time might be affected by your carrier. You can contact your carrier for an update.

All other payment methods—It might take up to 30 days for the statement to show the refund. If you don't see the refund after 30 days, contact your financial institution."

...and you used reportaproblem.apple.com to check the status of your refund request.

Try contacting Apple by using the appropriate telephone number from: Contact Apple for support and service - Apple Support

In my experience when I received a refund, it took at least 2-3 business days for the funds to appear as a credit.