Got call from this # also. They said since they had sent a letter and it was returned to them and because I did not return a previous call that the irs was suing me for intentionally trying to defraud the irs on tax returns. Told me that proceedings had been started and that I would be arrested and all assets would be frozen and liens placed on everything we owned. When I asked what address they sent the letter to it was to an address in New Mexico, I live in Iowa. Conversation got very ugly after I informed them I had called the IRS to see if this was a legitimate call. He thought it was awful that I would question his integrity. Never had such an infuriating call!