I also have gotten a couple of calls from the number (480)366-8786 mentioned above. I don't talk to them, but a woman says hello when I pick up and she knows my first name. I also suspect they are telemarketers, and I noticed that the calls from this particular number started very shortly after signing up for a bunch of things online which also seemed to result in a lot of spam as well.
I got a call from this number. When I answered a guy said hello Mike then just hung up. I picked up, so I could get them to stop calling. So far no more return calls. I'll be waiting.