I got one today too!  The man claimed I had a lawsuit against me from the IRS, it was a period of 4 years and that it was 1763.00. He had a very thick Indian accent and there was a lot of noise in his background, I told him that I had trouble understanding him and he got irate with me and told me I was being recorded and to stop interrupting him. WOW. I told him that I have received nothing in the mail, he told me that information had already been sent 3 times to my home, I asked for the dates, he put me a fast hold and gave me a date in January that was a Sunday, long story short, after arguing with him that if he were indeed the IRS, they could surely send another notice and work out payments.  I hung up.  This scared me, he had good tactics but after he informed they would not send me another...buh-bye.