Have been receiving calls from them for the past week now, I don't answer unknown calls if they left a message maybe I would call back, however after about 10 calls they still left no message.
I can't imagine it being debt collection seeing as I have no debt.
I received several calls from this caller as well, at intervals of 20 minutes for 5 times. I finally answered the phone. There was a silence delay at first, about 3 to 5 seconds so likely an automated dialer waiting for a person to pick up at the source. It was some guy with a foreign accent, talking about saving me some money on my electric bill. He sounded like he was leading into a sales pitch so I hung up on him. Given this information, talking to this outfit or person (whatever it is) may be a waste of your time.