They keep calling my number at 3:00 a.m. No one talks WHAT IS THIS?

same piece of s*** calls me too

3am calls from number... call it back and says none working number. A number of other cslls all from CA

They left a voice mail at my work number, but nothing is there - just a long recording of static.  One of many such to call in the last few weeks, all from US numbers, mostly based in California.