I get these all the time, like 3-4 a day. I'm pretty sure they are spoofed. I suspect, they are meant to look like your number so you might for a second think 'hey i recognize that number' and pick up
I had a feeling that was the intention, but I was surprised at the tactic. Because that does mean they are likely spoofing real numbers. But it does seem that that is something the FCC should crack down on.