Have you checked the email associated to your forum account (and possibly spam filter associated to that email addy)? Ban Appeals are usually replied to within 72 hours to the email address that you signed up to the forums with.
Worst case, Private Message the head admin ( memberlist.php?mode=viewprofile&u=21292
), and ask him to resend the appeal or to look into it.
Bans are not discussed in the forums, so if this thread gets locked you know why