I believe this a scam. He told me my address, which was not even in the correct city. When I told him that was not my address, he hung up. Also it's the guy with the thick accent.
This caller called my number twice. He left a message with an Indian-type accent. He said that I should give him a call (August 11, 2016) today unfailingly. He said that the IRS will institute a legal action against me if I fail to call.