This was my 3rd call in three days, so far. Don't know who it is. They haven't left a message when the answering machine picks up. I pick up the last call and they hung up.
I have received four calls in the past 6 days and ignored them all until this last one. I answered to tell them to stop calling me, that I am on the DO NOT CALL registry and when I answered it was a bunch of creepy white noise. So I just hung up.