Pretend to represent IRS: "Tax audit Department of The Internal Revenue service the very second you receive this message I need you to leave your work aside and dial a number the number is 214-935-8751. I repeat the number is 214-935-8751 now if you don't return the call or in case if I don't hear from your attorney either the only thing what I can do is wish you a happy life as the law enforcement team of your state will be soon at your doorstep Goodbye."