You might have to call the State Police HQ and ask for the Internal Affairs Department. They investigate local departments for malfeasance and/or dereliction of duty.
Another option is DOJ.
You are entering the same arena of harassment that I have been living with. Stand your ground!
So, I just called prosecuting attorney's office to report trespassing (per my lawyers advice) state police also said I would have to contact prosecuting attorney and not PD.
prosecuting attorney said they won't take a complaint, I have to go through police department.
I explained that we tried that, got nowhere, and my next call will be to internal affairs.
She said the prosecuting attorney will call me back.