Was this an official server, If so, you may want to review the Clan and personal responsibility section of the terms of conduct.
If it is an Official server and you want to appeal a ban , please contact Funcom through Zendesk, by selecting “Why was I banned ”, not much can be done on the forum.
https://funcom.zendesk.com/hc/en-us/requests/new
If this is a Private server, then you will need to speak to the server administrator(s) for confirmation on why you were banned and resolve it directly with them.
Good luck.