Google the internet for "Chimney cleaning scams" and you'll find that a lot of these cold calls are to offer ridiculous low special $ for a cleaning, during which the scam artist "identifies" safety repairs that must be made which will cost thousands of $.
In this case where they are hanging up on people, and making no sense, it's almost as if they are up to something else altogether. Like seeing who is home at what hours, based on who is answering phones, etc. Paranoid and insidious I know. But it makes no sense to start talking in garbled phrases and then hanging up. Something else is afoot here. Local police and the telephone company should probably be made aware.
I got a call yesterday from this number, I asked who was calling, fellow muttered "Allstate," I said "wrong number" and hung up, Chesterfield is in the western part of MA. Lonely person playing tricks? Weird.
Call received about 0815. A really sexy female voice said something like "Hi, babe. How you feelin' this mornin'". I recognized the Area Code as being from the Northeast, but she had more of a Southern accent, probably Texas. When I said "Who is this?" she hung up.