When you ignore Achilles, are you using the command /ignore or no? If you are, then how are they using server echo to talk to you? As I'm aware, once you ignore a player, messages from that player should not show anymore, but if this isn't the case then it most likely is a bug with the /ignore command.
Also, you don't necessary need to be trash talking to antagonize someone especially if you are replying to their insults in a distasteful way. I'll let trina and the other managers know about this before making a decision.