Real person, one inbox.
Include: what you expected, what happened instead, your iPhone model, and your iOS version (Settings → General → About). Screenshots help more than anything.
Most reports come down to a handful of known issues in the current version — alarms not firing reliably in the background, podcasts not being found, and battery drain. The FAQ covers what helps with each, and is honest about what can't be worked around.
Purchases go through Apple, so refunds do too: reportaproblem.apple.com. I can't issue them directly, but tell me if something went wrong — it's useful to know.