To date, I don't believe either the player or book has asked for our help to resolve this dispute. Without that, I must wonder what the purpose of arguing is here. Make people look bad, or find the truth and resolve the problem?
I don't have anywhere near all the facts I'd like to help here, but...
If a player used multiple accounts to circumvent limits, that is fraud. A book has a right to address that, in a reasonable time period. A book can't wait for a year and THEN address it - a book has to be alert. The general rule "You book it, you bet it" always applies, absent player fraud AND due diligence on the book. If a book gets beaten out of 50k before addressing it, that is not due diligence.
I don't have anywhere near all the facts I'd like to help here, but...
If a player used multiple accounts to circumvent limits, that is fraud. A book has a right to address that, in a reasonable time period. A book can't wait for a year and THEN address it - a book has to be alert. The general rule "You book it, you bet it" always applies, absent player fraud AND due diligence on the book. If a book gets beaten out of 50k before addressing it, that is not due diligence.