Try to get a restraining order against him, and find a local lawyer to try to sue him for harassment.
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As an attorney who counsels restraining orders and lawsuits against neighbors only as a last resort, I nevertheless endorse that course on these facts. Enough is enough -- you are on solid ground to force the system to take note of your problem and provide some relief. Move promptly for a restraining order and then get good legal counsel for a lawsuit.
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