Who called from 9712179531

Didn't leave a message but from what I read, how many of those google directory callers is out there?  At least once or twice a week we get those calls.

Call to DNC listed cell phone.

They call every week even though I press 2 "to be removed from their list."

calls  twice daily so annoying

they called, left no message. when I called back it asked me if I wanted to be added to the do not call registry but I didn't enter my number. want to do a bit more research first!