iTunes
How do i stop a payment that’s pending from iTunes
iPhone XR, iOS 14
Question marked as
If it is pending you can't cancel it, you can request a refund.
You can request a refund by following the steps in this guide:
Request a refund for apps or content that you bought from Apple - Apple Support
You are not guaranteed a refund tough.
This is an automated prosess, if you wish to explain your situation in depth to a person you can:
Contact Apple for support and service - Apple Support
Also see this:
How long refunds from the App Store or other Apple services take - Apple Support
Good luck!