The ones I hate are the bill collectors calling for people who had the phone number before me. I just changed my phone number after two years, because all day long all I would get were calls from some bill collection company. Finally I downloaded a phone call handling system onto my PC and recorded the calls. I told them that I was not the person they were trying to reach and polity asked them not to call me back. They continued calling.
Each call I would talk to them and each time I would get a bit more angry. They would say things like;
"Well if you want the calls to stop, then pay this bill." or "We know who you are and where you live, so you had better pay this bill or else." They would go on and say things like:
"We can have you arrested for not paying your bill."
"Do you own a car? We can take that too."
Generally they were all just plain nasty folks.
Finally after I thought I had enough proof to prove that they were harassing me, I contacted my lawyer. (They don't come cheap boys and girls so don't do this unless you have too.)
He sent them a nice letter detailing the calls and such and how they violated state and federal law. He informed them that I had a case for harassment since I was not the person they were looking for. The calls continued. I changed my phone number and had my attorney file a suite against them. That got a response in a big hurry. They counter sued stating that I had no legal right to record my phone calls. (Um yes I did, you see the answering machine on the PC picked up before I did and clearly stated that the conversation was being recorded.) The case went on for most of the year and was about to go to court when the collection company offered a "resolution" to the matter. It would seem that they were under the impression that my state laws did not apply to them since they were not in my state. They were wrong and if the matter had gone to court, they would have lost big time. Additionally they were being investigated by the State for doing to others what they did to me. Threatening them.
It was not much, but enough that it payed off my new car.
So yes, if you have the money, you can go after harassing phone callers. But you had better have a lot of proof.