Currently, there have been no 'new and official' sets of rules put into place for the chat. All the rules on top of the chat room have been the same, but the ones that Carole added yesterday are to, more or less, re-enforce the rules that were already in place, for people who have misunderstood the chat ban reasons/lengths.
Now, to quote rule 9: "You may advertise but only once every 15 minutes..." It doesn't matter if it's a plugin server, or something that you need help with, if it's an IP that you're posting for people to come on, and you do it either A) in the Lobby, or B) within the 15 minute rule, then it will result in an infraction.
A certain number of infractions (3) will ban you for a day. Depending in the severity of what you did to earn an infraction, they are usually placed by the 1's.
If you have a problem with a moderators decision, try to PM that moderator about what happened and try to solve the issue. It could of been our fault for all we know (since we are humans, we make human mistakes).
Same goes with moderators deleting your post; as far as I know, when a moderator removes/disables a post, a comment/PM is sent to that person by the moderator who removed it explaining why it was removed. If you can't figure that out for some odd reason (for it could be a site glitch that didn't allow you to see that), PMing a site moderator or a Super Site Moderator can fix that issue.