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 — such as an incorrect balance, a broken flow, or unexpected behavior — the most useful thing you can do in a product like this is note what happened right before it occurred and report it to whoever is maintaining the 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.