That's on us, it's a system mute set on a string with good intent, but obviously this chat is of no concern.
You were muted at 21:27 18 July, I can see you appealed the mute at 21:55 and we processed that appeal (and removed the mute) about 10.5 hours later at 08:34 19 July.
Obviously we have updated the auto mute to stop this happening again. Sorry for the inconvenience, I've bolted a couple of days of extra membership onto your account in recognition of the poor experience you've had here.