Serious complain about a moderator

Hi, I would like to report a moderator who has abused his power against me. I got an universal mute for no reason and could not write in the room where I was hosting. Normally, one would expect a warning if one's behavior was inappropriate, but I did not get a warning. I just was muted and could not write to my fellow players. I don't think it's okay and would like to know how to report this moderator.