Who called from 7343522066

Has called twice in a week or two between 8:00 & 9:00 in the evening.  Caller ID says "Michigan Caller".  I don't recognize the number, so I don't answer.  Rings three times, then they hang up before my answering machine kicks in.  A Google search on the number only turns up that it is a business land line out of Ann Arbor, MI.  I don't know anybody in Ann Arbor, and haven't done any business there.

Rang twice, then hung up.before I or the answering machine could pick up. Caller ID showed call was from "Ann Arbor MI"

Called but wouldn't  identify himself. I think it's a collection agency.

Received call, knew My last name, but wouldn't identify himself. I think it's a debt collector.  Asked for f/m not at this address.

If you call the number back it says they are calling regarding a fundraising opportunity.  
Not a debt collector, just want money for some neighborhood project.  Sounds like a HUGE scam.