I have been getting a call from 520-000-000000 too. I have not answered it and they do not leave a voice message. They have called me twice this week. I am getting really annoyed by it. I wish I knew why this is happening.
They keep calling my 15 year old son's phone and saying "Bueno". I tell them to not call me again and they keep it up. It just started but he is getting about 3 calls per day over the past 4 days. I hope the law shuts them down !!!
Mon Feb 11 @ 5:57pm - Received a call from them to my cell phone here in IL. I did not pick up because I did not trust the number. No voicemail was left. Thanks to people for posting about this.
I got numerous calls from this number and other numbers which some had 12 number while others had 10...or even came up un available...but they kept calling back to back for about 10 minutes i could hear someone on the other line if i answered but they would just hang up. i guess they gave up now.