The "Customer Service" entry on the Sign Up screen and similar entries elsewhere in the app are placeholders that demonstrate where a real live-chat or ticketing integration would go.
If you notice a bug — an incorrect balance, a broken flow, or unexpected behavior — the most useful thing you can do in an educational product like this is note what you did right before it happened and report it to whoever is maintaining this project.
Questions about the Terms, Privacy Policy, or any other policy page can be directed the same way, through project maintainers rather than a live support desk.