Okay. I want to settle this once and for all. The only way to unban is to have a staff account with the permissions to do so. If you did manage to get your hands on this, you would be banned on that staff account and your account would be re-banned.

If there were to be an unbanner it would be because a program or site was made that logs in on the staff account with the permissions and unbans your account. You would be caught either way and it would have been pointless.

Finally. Even assuming someone DID take the steps to allow you to do this, you would be banned on the account AGAIN anyway.