After you have eliminated the likely suspects, you can move on to the next step in stopping harassing phone calls. This is to let the person who calls you know that you will be making a report to the police. Simply notify the person that you will be reporting the call and that you would like to speak with them later about the call. Then, explain to them that if the person continued to harass you, you may want to hire a lawyer. A lawyer will protect you and give you the protection that you need to feel comfortable reporting the harassing call to the police. You should also let them know that you want them to stop calling you.