I wrote a post about that last year. Threaten to sue them for harassment and violating your civil rights. That's what I had to do when we moved down to take care of my mom. She had Alzheimer's and dementia. The neighbor from hell, who moved in when I was 10, continually harassed us for 3 years, until I lost it and started screaming at the cops.
Get a lawyer. Sue the living hell out of everyone involved.
Get a lawyer. Sue the living hell out of everyone involved.