Caller ID displayed as "UNASSIGNED", following by an unrecognizable number. I let it go to my answering machine. They didn't leave a message. I dialed back the number and encountered a recording that said, "Hello and thank you for calling. For any heating and air conditioning services, please press one. If you are looking to install or replace heating and air conditioning systems, please press 2. For our marketing department or any business related offers, please press 5."