The new scam is that you get a very official sounding phone call from the Internal Revenue Service or the Untied State Treasury of America. Please do not talk or give any information to the person on the other side of the phone. The best thing is to hang up or write the number down and report it to the IRS. Usually these phone calls are about your refund, bank account error, taxes due, or error in your return.
IRS does not call anyone, if there is an issue with your taxes, you will be receiving a letter from the Treasury or your State. Even then, you need to examine the letter and make sure it is a legitimate correspondence.