Same thing happened to me this morning. I came into the office and had a voicemail on my work phone. No message. Just a guy's voice "Hi, this is Richard Thomas at 908-372-2640...." I called him back figuring it could have been a customer or something important since it was at my desk. He said it was the wrong number.
"Richard Thomas" left messages on 3 extension lines in our office. Calling back gets a voice message about me calling him back later. Bad marketing ploy.