Claimed to be "The Office Investigation, Fraud Diversion Unit", said that they were looking for (insert name here) regarding a specific case L#####, I asked to speak to a supervisor when the first girl could not give me their address or state.  The call came from a Houston, TX number.  I hung up after being on hold for 4 minutes.  Then a "supervisor" named Lisa Fitzgerald rudely called me back and in a threatening  tone asked me about said person, I told her I was not aware of this person and to take my number off of their call list, which she claimed to do before abruptly hanging up on me.