There are ways to handle situation like this, though you will need to fight fire with fire. He spoofs you? You spoof him and target someone who DOES have the power to take him down. See how long he lasts when the same things he does to you are done to a politician’s daughter or wife — but in his name. He’ll last about ten seconds before he goes up in flames — then you can throw fuel on his fire by showing the evidence of his stalking and harassing you. Hammer that last nail into his coffin.