Well this really admin abuse because people who get muted/gagged should stay that way until the map changes or the admin decides to unmute/ungaggged you. Still i do question his methods.... But their is the rule that Admins Have Final Say!
To be honest if you leave and rejoin the server to avoid being muted/gagged that's breaking the rules by avoiding punishment and it should be a 1 day ban!
But lucky for you, kravin was being a nice guy and didn't ban you instead he let you stay and play, all you couldn't do is talk and type.