To be clear, Evenbalance the makers of the punkbuster software have detected something (we do not know what) that triggered a violation of the terms you agreed to to play the game. PBBans, may or may not be hold said violation (if you joined a streaming server they will have it listed), thus displaying the above message.
Now just like any software there are bugs, glitches and even wrong doings, PB has in the past found false violations withing there software and corrected it. However you are talking about a game that is riddled with hackers, and older version and not as popular as it once was. You need to take your issue up with EB and be nice about it.
Here are some helpful things to look at (yes one of the link takes you to another AntiCheat site) still good advice.
evenBalance Ticket: make sure to open a ticket at http://www.evenbalance.com/index.php?page=support.php also please read this http://board.ggc-stream.net/index.php/Thread/8525-Warning-NEVER-download-or-test-cheats/ if you need your GUID use this link http://board.ggc-stream.net/index.php/Thread/15524-HowTo-What-is-my-PB-GUID/ you must be patient all staff members are volunteers. It does not matter that your account was hacked/barrowed/sold/or misused. Account security is the account owner's responsibility. We(ggc, ACI, or pbbans.com) do not ban the player, we ban the account once it has been compromised.