If you haven't been around in many months, sounds like you got hit by that old bug from a while back. I think they said you need to make a ticket and show proof you purchased M+ or something. Or if you have no proof it will just take longer.
Maybe someone should suggest to the admins to consider maybe a button for the bank itself so more people check it out. And maybe inside the bank page put some sort of short explanation as to how the system works.
There was a rollback so anyone that posted in that 36 hour or so period lost their posts during that time. Things like coins and rank purchases made during that time were also lost.
Except of course if it is lost from a rollback or a bug. But the mods/admins or even a regular user might hook you up with the coins needed to get it back in such cases.