Getting billed for volume I can't delete

Just got an unexpected invoice for a volume, when I didn’t think I had any volumes. fly volumes list requires an app, and fly apps list shows that I have no apps. How am I supposed to delete this volume?

This was the result of a volume that you did delete, but it didn’t get marked properly! We fixed the bug, refunded the charge, and put a $100 credit on your account. :slight_smile: