I also received a similar call from the same person. When I called back, they asked me to hold and then asked me to confirm my name and said that I incorrectly filed taxes in 2013. They did provide a name and a "badge number" and asked if I had received something from the IRS previously. When I said no, they started asking questions about how I filed taxes, etc. The call actually disconnected on its own but I am not going to call back!