Who called from 9196944078

I've gotten 3 calls from this number doesn't leave a message and hangs up every time I answered

Energy company - energy service scam

we are on a do not call list-seems like we get more calls than ever-I will not answer unknown numbers that also have no identity on caller ID

I've gotten 2 calls in less then 2 hours,  no message left.  I don't answer my phone if I don't know the number.  Tried calling back and a recorded woman's voice just says good bye then disconnects

had a call, it is from Cary, NC. they did not leave a msg. I did not recognize the #. I have no idea who they are or what they want!