[NEED HELP] Disable chat message sounds (checkbox not working)

Anyone figured out the trick to disabling chat message sounds? 
I unchecked the checkbox in settings
I tried some basic troubleshooting steps including reloading the game client.

Nothing I tried works :-(
I would love to figure out how to resolve this issue because I checked out the game after not playing it for a very long time and it is SO FUN, but sometimes a few obnoxious people abuse the chat message sound feature.

I am running the game client on Debian with KDE(kwin wayland)

Many thanks

con_chatsound 0. you can also make it a bind with bind [key] "toggle con_chatsound"

You can also filter those people out of your chat using a server-specific list managed with the `ignore` `unignore` and `clear_ignores` commands.

Code:

ignore <client>
  Where <client> is the entity number or name of the player to ignore keeping out of personal chat log.

For difficult names you can get the current client entity number with `status 1`.
If the server and client are recent enough there's scoreboard icons for currently ignored players.