So it seems that FB wants to be in line with other airlines and make their audit dept busy, so they sent this email out to my friend.
I highly encourage this audit guy to take a English grammar/spelling course.
Dear Mr xxxxxxxx
Your Flying Blue account xxxxxxxxxxx has been indentified as credited since july 2013 by illegitimate Amex transfers .
We remind you that the Flying Blue and Amex partnership policy allows only Amex transfers at the same name as the FB Member ,
Also miles or awards sale is not allowed according to the article 1-4-7 of the Flying Blue program Terms & Conditions.
As a consequence we inform you of the definitive closure of your Flying Blue account xxxxxxxxxx .
You are also requested to send us back your Flying Blue card xxxxxxxxxxxx to the following address:
Air France Direction du Contrôle interne et de l’Audit interne,
Prévention des fraudes Air France - DYPF
95747 Roissy Cedex
Best regards
Mj Ballion