It just seems highly coincidental to me: you were messing around earlier that day and I verbally warned you to adjust your behaviour and then I saw that ad from you pop up. I know what server you refer to as I (used to) play there too and I know the ways of advertising there are slightly different than Argonath's to say the least. I can in fact believe it was a honest mistake but at that time it just seemed too coincidental, I hope you can understand that.
Let's say it was indeed a mistake: how will you make sure this will not happen again if you get unbanned? To what key did you have that advertisement bound to make you type /ad first, followed by the recruitment for a specific faction in a different community?