Same experience - spoke illegibly, left a reference number, and said to have a bill handy.
Ditto - thanks for this site. Calls like this can catch you off guard.
I received a call from an unknown caller and the VM shows 718-682-3197. Woman with an accent states that she wants to discuss fraudulent charges on my electricity bill and to have an electronic copy and my reference number available.
**considering I dont have an electric bill in my name....THIS IS A SCAM!
"Hello this is Rebecca Davis. I left you this message regarding the supply charges on your electric account. Give me a call back at 718-682-3193 and have a copy of your electric statement handy to review your reference number is NY556987." I was suspicious and called back. When the man on the phone saw that I was calling from Michigan, he said oh nevermind, we called you by mistake.