Most helpers actually only mute for public chat and not team chat/plot chat or whatever. Although if he was spamming something like that I'm sure he would've gotten muted. So don't get mad at that specific helper because most helpers actually do the same thing.
Hi, rules are global, so if you break one in /msg or plot chat you will be punished for it.
You can report this player here: https://www.mcfoxcraft.com/support/4/select
/closed