I don't understand why you're spamming us with all of this though? SE Customer Support doesn't really read these forums outside of the Technical and Bug report areas and there's nothing we can do about it. How on earth did you even "lose" 20mil in the first place and how much of SE's fault do you think it is that they'd even do a rollback? Did your gil literally disappear or did you just spend it on the wrong thing or get yourself scammed? They aren't going to fix anything that they perceive comes down to carelessness or lax security. The "how" is very important in determining whether or not SE will even help you by the time they actually address your ticket.

I know from personal experience. A few months ago some mysterious person seemingly joined my FC of his own accord and instantaneously took millions of gil from the FC chest the moment a member deposited it (happened within less than a second, according to the logs). They appeared to be a gil seller or bot; they were a level 1 paladin, nothing else even unlocked and had the same exact name and character across multiple servers. A cursory search of their name online also produced a similar event with someone else on a different world with the gil being taken in exactly the same way.

Unfortunately SE wouldn't do anything because technically the FC permissions allowed the thief to access to the chest. They glossed over the fact or simply didn't care that this guy (seemingly) got himself into the FC and (according to the person whose gil was taken) "forced" the victim to deposit his gil into the chest when he went to interact with it before instantly robbing him blind. All of this again happening within about a second according to the FC and chest logs.