Had probably about 7-8 calls from this number in the past 2 weeks that even my phone identified as spam. They never leave a voicemail. I answered once, and it hung up on me after I said hello. One other time, I talked to a person (or robot, not sure) asking me to participate in a survey to which I told them to put me on their do-not-call list. I've still been getting the calls.
Don't ever answer these calls. If you do, they know it's a live # and they'll call you again and again. Google the number. If it doesn't identify a person or business you know of, block it immediately and be rid of them.