I have been receiving these calls for a few months. Different numbers, same message, as well. I did call one back (months ago) and they ask you to leave your name and SS #. The mailbox was full; full of poor people being preyed upon by these horrible people. I contacted IRS. The comment above with links to the IRS is correct. They will NEVER call you first. Always written information. You can report these telephone numbers to the IRS, they are aware of the scam. It has been ongoing for more than a year. Why can these people not be contained?