The Chicken story
Although the details can be elaborately made, it would still be only a surmise (because had I concrete proof that such and such jerks intrude and interfere to make money by being parasites (ie., by acting as extortionists on behalf of you by representing you with either the company or the client without your knowledge or consent to extort money from them as well as from you for protecting you (from their own created problems) from them - a kind of a double cross but done anonymously because clients are anonymous, too, is probably their base reasoning factor) I would have initiated action against them but the moot point is, even if such nexuses do get pinned or identified, only the local police of the region would be able to do anything but which may balk due to regional bias and all the while the damage to the client and to your business would have been done. I have actually experienced something similar at a low scale, in a real time job, when a jerk sent an angry smiley to the client from my Skype, that he instantly made it seem like a prank but which describes the essence of such people, who believe that you 'should' show your anger because "given the same situation, we would have been angry so, therefore, you, too, should be and if you are not, we will proxy or act on behalf of you or using you..". I think this about sums the weirdness of it all.
Looking for some help (not for me but what seems to me like a pest of a nexus in these parasites) or comments to take the conversation forward to arrive at some conclusive resolution point from where action could be initiated.