IBIS tag is only to be used by clan, IBIS.A is for admin.
Use of IBIS tag when not clan is bannable, as you were told, on multiple occasions. At the very least 10 times (10 bans before the perma), and we know its more then that because many times you were warned in server or kicked.

Yes the one time I played with you I did let it slid, but I also said It would be wise not to be using Ibi$ in front of other admins.