Call just came through from this number on my cell. I didn't recognize the number so I didn't answer but then a minute later the phone gave me a "voicemail message" beep so I checked. The first part of the message was cut off but I could tell it was a synthesized female voice that sounded American. The voice repeated the phone number and then said "Don't disregard this message and do call back before we take any action against you. Goodbye and take care."
I looked the number up and it does appear to be from Magic Jack (Ymax Communications) so I checked their site and found an email address to report abuse to. It is:
[email protected]
I've sent them an email describing my experience but since I didn't call the number back all I have is the voicemail message. If anyone who has actually talked to these scammers wants to email Magic Jack that might give them more information.