Pending charges are blocking me from downloading other apps from the App Store

I canceled my subscription to an app, and the cancellation was confirmed. However, a pending charge from that app is still blocking my ability to download anything from the App Store. Since the transaction didn’t go through, I can’t request a refund or report the issue.

Has anyone dealt with something like this? What should I do next?

[Re-Titled by Moderator]

Original Title: Pending charge blocks downloads, but I can’t request a refund