What do most of us do? Block the numbers, install apps to block them, yell at them, curse their name, not pick up.
Consequently, if you can find out who they are as AnimalMuppet rightly indicated, you can make them pay YOU. Personally, I've collected nearly $4,000 generated from carefully drafted letters to the violators. I am sending off a demand for another settlement payment soon, I just haven't had the time to schlep on down to the post office.
The money represents an out of court settlement. It works. They would rather pay you and have you shut up, than you drag them into court. USUALLY, you have them dead to rights and the process of discovery should you go to court would reveal they did in fact call you.
It's an investment of your time, you have to take the call and convince the salesperson they are about to make a sale. Usually you can get the info if they think they are going to make a sale. I feign interest in what they are selling. Some of them are really good and won't give up any information because they understand the risk of doing so. I've had both experienced and non-experienced reps on my phone.
Funny thing is, I get less calls now. They've practically stopped at least for one vertical - auto warranties. I suspect I may be blacklisted or they somehow share information with each other, because there is a very high probability that if you call me, your company will be writing me a check.
I am happy to divulge more information, my friend has written an Ebook on the subject in detail complete with template letters and is a complete "how to" guide on collecting money from the robocallers. It's extremely satisfying. Only cost $47.