I have been blackmailed like this a long time ago, embezzling money by making such threats online is nothing new. They somehow managed to find a password I was using and try to blackmail me with it. But I did not hesitate to tell them that you can do whatever you want. I have no problem, I refuse to do any kind of mutual. Even though they were mailing me over and over again, I just simply ignored it. At one point they stopped threatening.