Just got a call from this number. No answer. I think it is someone wanting to know if my number has a person at the other end so they can sell the info to the other scammers.
Call is from air vent cleaner, so they say. It sounds like it is from overseas, and is likely a scam. I warned them that I can have them charged as we are on do not call list. Be careful with these guys - I called the number back and it is not in service, so is highly suspicious!