I don’t take phone calls from numbers that I don’t recognize and haven’t for close to ten years. It’s never caused me any problem. You might want to do the same.
I had been “sorta” doing that but I get so many on my cell from numbers I don’t know that I usually just answer but don’t say anything and wait until they speak. Most just hang up. But from now on anonymous and unknown will be at the top of my ignore list.