After you file

Turbo Tax said return had no errors.  Filed and accepted on 3/29/20.   Refund received in bank 4/13/20, but $744 short.  It is now 6/11/20 and no letter of explanation.   There is NO Offset.  Unable to get info on line.  Called 3 local offices and still get recording that they are closed.   2nd Quarterly estimate is now due, so I'm sending a letter with the check asking for explanation.   It has been 2 months.