whenever you break a rule, a moderator will quote your post and tell you what you did wrong. if it wasn't in a post, it might have been somewhere else (such as rude messages to someone through the private message system, which they may have reported you for, though if you didn't do that, it is quite obvious that is not the cause).
if you'd like it adjusted, you should probably speak with a staff member about it. a topic isn't going to do much, it'd be better to message the staff members and ask if they were the one to give you an infraction, and ask why.