I received a message from a Mrs. Wilson to go over my electric bill

I also received a voicemail from "Mrs. Wilson" to go over my electricity supply charges.  This call sounded fairly legit, she even left a "reference number" (for the phone call, or my supposed account, or something).  But I was immediately suspicious because I recognized the southeastern PA area code, and I live in MA.

Caller ID records a different number each time they call.  Thery state they are from PPL.  The number listed is what they requested I call back.  They left messages regarding saving money on my electric bill but keep ppl.   (800) 342-5775 this is PPL official phone number.

Did not reference who they are.