It's the scammers at Direct Energy.

Periodically get calls from this number.  Caller ID says "Branford, CT"

This # calls at least three times a day. Finally I picked the phone up to give them a warning not to call me  again and wouldn't you know nobody on the other end. Caller I.D had unknown caller on it.

Called 10:10 am asked if I was a Michcon customer and I said Yes he said thank you and said he would have to call me back later and hung up. Can't find any info on them.