First try Settings → Restore Purchases in the app. Still missing something? Pick "Purchase / Restore Problem" and include the date and what you bought. Refunds are handled by Apple: reportaproblem.apple.com.
Pick "Bug Report". Tell us what happened, the mode you were in, and what iPhone and iOS version you play on.
Pick "Account / Data Request". You can also delete your account instantly inside the app: Settings, then Delete account. See the Support page for details.