After multiple calls, I finally got the caller to admit that these calls are from one Dana Clark, a chiropractor from Pacific Coast Spine and Rehab in Los Angeles. Tried to get a lot of information from me before giving me any contact information. I asked them to remove me from their call list. We'll see... Here's their info:
http://www.pacificcoastspine.com/about.html
11110 Ohio Avenue
Suite 108
Los Angeles
California
90025
Same as the others, I am receiving 1 - 3 calls per day from this number and no one is ever at the other end.
After calling the number many times, I got someone who said, "Dr. Clark's office," became evasive, and hung up on me when I told him I was on the Do-Not-Call List. After that, I couldn't get through.
So I called Pacific Coast Spine and Rehab, at 310.473.7130, per nnoack's post, and the receptionist confirmed that a company with Caller ID, "DRG 856.295.5561," was making calls for them that were all supposed to fall within the 310 area code, which my number does not. She said I was not the first complaint from far outside the So-Cal area.
She was very polite, apologized, took my number, and said she would see that it was removed from the calling list.