I must agree with the previous advice. I will say, you do not have to answer the door when the police knock unless they have a specific reason for coming there, like they have been called there for a complaint and not just to check up on you. As far as the neighbors, you can go to the court and speak with the clerk about getting a restraining order against them if they are harassing you.
You have a 4th Amendment Constitutional right to be safe and secure in your own home. The police cannot just stop by for no reason. If they continue to do so, then you need to hire an attorney to file a lawsuit against them for violating your rights. This is also the type of suit that the ACLU loves to handle free of charge and you should consider calling them.
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