Via email sent 1st page of acct statement + copy of Senator Credit Card (credit card nr partially erased). After 2 days got request to send copy of Senator card. Replied via email that Credit Card serves also as frequent flyer card. After 2 more days received info that status match is granted (already visible in my topbonus account).
Thank's to Air Berlin. Polite communication, swift + positive response.
on January 13, 2016