If you look at your missed call history on your phone, how many of those calls are from a number you don't recognize?
I get roughly 5 robocalls a day, which doesn't seem like a lot, but when the calls come within minutes of each other, it just gets annoying and overwhelming; and even when you do answer, just to see if you can get someone on the phone for the sole purpose of messing with them, there's never anyone there.
Unless messing around with randos on the phone is kind of your thing, you can finally make the calls stop.