Yesterday I received 2 calls including one where they left a message asking me to call back.  When I called back I spoke with someone with a strong accent who identified himself as David Stone.  He said that I needed to pay my bill in full now or they would file suit.  I advised him that the IRS can not change the terms of our agreement....and any information would need to be in writing.  He tried to get me to tell him how much we owed....Said IRS had held a meeting and now all was due immediately.  He said they would file suit if i didn't pay in full now.  I said too bad....the IRS needed to send a written notice...and they don't call.  When he kept on, I said how do I even know that you are the IRS....and then he hung up.