If your account was permanently banned, then there is no way to appeal and the ban will not be removed.
Permanant does mean forever and Ebay don't go into their reasons for banning you in case that leads to members being able to circumvent a ban.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)
