I missed the call and called it back. Got a recorded message offering to remove me from their calling list. I pressed 1. That was yesterday. Today I got the same call again. So I figure ChuckE has it right--they're collecting phone numbers to sell. :-P
Get a call from this number at least three times a week, twice a day. I let it go into voice mail since I have no idea who or what they are. They never leave a message to what their call is about.