Hmmm maybe a flag system like we have on the forums, where if someone gets kicked and thinks it’s unfair, can flag the kickers. Only if a kicker gets X number of flags, then Blizzard can look at that situation and take action. Same for the kicked. Flag them and if they get X number of flags, Blizzard looks into it and takes action.
Maybe the number of flags can be high otherwise it can be abused as well, but if they get a ton of flags, it should be brought to Blizzards attention and they can look into it just like the forums.