Called and left no message, so I looked the number up on www.whitepages.com.  It appears to be Peerless Network or AT&T.  Assuming they are trying to sell phone services.

Call and hang up. Third or fourth of the day, all different numbers that are scams.

This number calls 5 to 6 times a day

Yet another number related to so-called healthcare.  I never answer unknown numbers and now have a collection of scamming callers/companies trying to promote low cost healthcare:
281-417-7346 (TX area code)
813-369-5130 (FL area code)
954-256-8385 (FL area code)
305-230-4322 (FL area code)
323-474-0317 (Los Angeles, CA area code)
631-318-3217 (NY area code)
281-665-8498 (TX area code)
571-223-7986 (VA area code)
713-853-9545 (TX)
414-877-1454 (Milwaukee, WI)

Searched multiple sites.  Most come up as healthcare telemarketers.  Ever since hearing about scams & hijacking of info from mobile phones while on "hold", I never answer unknown numbers, or call back. As I've already blocked the above 10 numbers, there's always another that comes up 2-3 days later.  I recommend not answering any # you don't know...ever =)

Call . .never leave message ...they are stupid