If you were z-lined for pasting something that a bot had posted, then it's likely that the bot had permission to post that information.
Contacting Coldfront admins is your best option, and I would suggest you explain your situation, and if you have a log of the bot posting the same thing you were Z-lined for, have it available to be sent to the admins.
You could wait and hope that the Z-line is temporary, but if you try to connect to the server while the Z-line is in place, you'll probably just end up in extending or making the Z-line permanent, due to attempted ban evasion.
