IF you talk to them be very careful!  Yes, they are from IGS energy - they ask to speak to the person who is in charge of paying the Columbia Gas Bill.  THEN, they ask if it is you, by name!  Then - they tell you that THEY HAVE BEEN SUPPLYING the gas service and they ask you if you are past due on your gas bill - not sure what that's all about!  BUT - when told that Columbia Gas is providing the service, they say they'll notate their records and they hang up.  To me, this looks like a scam to deceive you and get you to switch to IGS energy . . .

These calls are from IGS energy. They never leave a message.