Can you prove that is your brothers account and not an account you made yourself to try and hide that it was you hacking?? The admins here have to protect their servers. Therefore, they can not allow you(IP and Accounts linked) back into their servers. It's nothing personal. They don't hate you or wish you any harm. They are just looking out for their servers and playerbase.
That being said, I feel you are wasting yours, and the admins time on this issue. Sometimes, we need to accept the decisions of the admin(no matter how much we don't agree) and move on to another server. I'm not trying to be rude or cause you grief, just trying to explain it so you'll understand. You need to take this up with your brother, and not Skial.
I hope you fully understand their decision and respect it.