Document
A screenshot with its time, the bet ID from the slip history, the app version and phone system - then support from inside the app.
Advancebet
If an Advancebet deduction looks wrong after your bets settle, ask support for a transaction statement.
Escalation
After the platform’s channels, the Anjouan licensing body.
A precise description
State what you were doing before the error, whether it repeats, and whether it also appears on the site or only in the app; this greatly shortens the fix.
After reporting
Keep the complaint number and the chat log until the case is closed, and reply from the same channel if asked for an update.