I received a call from this number and they left no voicemail message. Someone called my dad, who is in his 80s, and told him that he had been hacked. Not knowing better he gave them access to his computer and they locked it up.  They wanted his credit card number to unlock his computer. He refused, thankfully. This happened about a year ago so I had not heard of this prank to inform him about it. He had to take it to a software engineer and have it reprogrammed and another version of windows installed. Never give anyone who calls that you do not know access to your computer. And be sure to inform your parents about this criminal act that's going on.