Thanks to those who ID'd this as an Energy Switch spam from Duquesne Light.
Who ever called was on a static line and only left 'Hello, Hello?" as a message.
Calling this a prank because if you want to switch your Energy company you ought to do your own research.
Never play with these cold call twits who for the most part are just phishing for your information.
They may say they are related to your primary company but they are not - don't believe them.