How could he be threatening you? As a buyer, he isn't privy to the same sensitive info about you that you are about him. If this is the case, you should have reported it and let the staff deal with it rather than blackmailing and threatening him. As a vendor, you have a responsibility not to misuse the information people give you. If he's an asshole, then so be it, but you're a vendor and you cannot behave that way toward buyers who have trusted you with their info. Also, if he was threatening you, then I'm sure that DPR and the staff saw this as well when they were looking into it, and will probably deal with him as well.