On a defensive note to the original poster- yes it does suck to have money taken away.
But, due to you having no proof.. noone will feel sorry enough for you to give you 300k or any donations.
If anything, you should e-mail SE and contact GM 1-209024 times until you get the answer you want. Because, at the end of the day, it's SE's responsibility to keep your account safe as well as your own. If you have given out a password to your account, then it's your fault. If you haven't, then pester GM's, make a petition with other people, etc, to get your money back.
As for nothing left.. you could always regain money lost i'm sure, even if you get 'no' when repeatedly trying. Money isn't everything; skill is. As is kindness. If you are a highish level i'm happy to do a BCNM40 with you or something similar if you have enough seals to help you recover w/e. But i will not give you 300k.