Caller ID displayed as Unknown name, following by an unrecognizable number. I didn't answer it and let it go to my answering machine. They didn't leave a message. I dialed back the number and encountered a recording that said, "This call will be monitored or recorded". It rang several more times and then another recording said, "Currently, all of our representatives are busy working with other customers" and that "a representative will be with you shortly." Music played in the background, then I was sent to voicemail with a greeting that announced that extension number "18664780530" is "unavailable" and to "leave a message after the tone." I didn't leave one and hung up.