If you suspect another player of cheating in some fashion, please report the player with the appropriate evidence (recordings, demorec, etc) to the host of the server (in this case, you would register and file a report at www.elitekamikazeteam.com). Server hosts generally report egregiously malicious users to the development team, who can then be banned globally from the game when given sufficient evidence. If you disagree with the administration of a server, you are more than free to join (there's not exactly a shortage) or host and promote another server.
With that said, I don't personally think the player is/has/was cheating. Regardless, you began verbally assaulting "Fred's", which isn't productive if you're trying to prove or convince other players that "Fred's" cheating. It's far easier to prove that you acted maliciously toward the player, and thus you were muted by the server owner; EKT (as far as I'm aware) allows players to appeal bans/mutes, so I'd like to again direct you to www.elitekamikazeteam.com if you would like them to remove the mute.
Since he's a newer player, he likely hasn't because there's not really any obvious way to know about these server-specific chat commands.