This number calls me at least twice a day. Once I answered and there was no one on the other end and the second time I answered they asked for me by name and I hung up. All other times I let it go to voice mail but they never leave a message.
They called, and didn't say anything when I said hello, so I hung up. I called the number my caller ID showed, and it identified them as The Share Group. Their web site id's them as a direct marketing association serving non-profits, schools, universities, hospitals, political campaigns, etc.
They do give an option to remove your number from their calling list.