I get calls about a warranty for a vehicle I no longer own all the time. Well, this time, I called the number back and may have found success. You should try it.
Getting a ton of repeated calls from a robocall number isn't necessarily going to happen. But beware of receiving them from "spoofed" numbers. That's a different story, altogether.
Am I dreaming or did we all sign up for a "Do Not Call" list about ten or so years ago? Somehow, some way, I'm still getting calls from mystery numbers or worse, unknown numbers. If you received a call from these folks, you may be getting $500.