GMs don't tell you in-game because it could out the person who reported it. I know it's kind of nutty, but they also feel the player probably knows if they doing a ring of questionable behavior, they should stop doing it. It just doesn't help when they don't say the 'type' of action cause griefing can be a lot of things.

But if you d/c and not logout, or remove yourself from a party that is reportable, and it's spelled out that way in the ToS example list. Because if it happens at the beginning of a dungeon they have to wait several minutes to even kick someone, so they might have asked for a GM assistance in-duty and probably retaliated for this.