I  decided to call 'him' back.  He was antagonistic... :"What have you done?"  I told him that I had the IRS webpage up and was perfectly willing call the Commissioner of the IRS to "check his badge number."  He said,"How do you know I'm from the IRS?"  I suggested he google his own number:  that his scam was all over the net. He told me to "suck his a-hole" and that he would "get me."  I asked if this was a personal threat, and challenged him to get any policing authority to show up at my home with a warrant.  He then said he would "f--- my a...hole."  I told him to get a different number, that he was all over the net, and that I had reported him to the IRS, FBI, and the Federal Trade Commission  I told him then that he was preying on the old, the ignorant,and the poor, and that we would put him out of business.  His answer was "f___ you!"  My suggestion:  call this guy back and challenge him.  His only response is nasty expletives.  HARASS HIM!  Play back his game!