Payment is processed and managed by Apple. Unfortunately, I have no way to personally issue refunds. Please contact Apple for assistance. Please note, requests for a refund may be declined and there's nothing I can do about it.
Here's an Apple help support article that can help you get started with the refund request process: https://support.apple.com/en-us/HT204084
This article from iMore may also be helpful: https://www.imore.com/how-to-get-refund-itunes-app-store