Received a bill from the IRS

3 Weeks ago I posted here asking if I need to file an amended return. The answer was 'no just wait' ... but today I received a bill from the IRS for the amount owed.  The details are this...

 

I filed in February and owed $842. Before actually sending the payment, the Unemployment Compensation Exclusion of $10,200 was announced.  This applied to me ... in fact, my turbo tax software automatically updated and added the full exclusion. My dollar amount at the top of the software went from owing $842 to a refund of $323.  I thought maybe I'd have to file an amended return, but again the answer was 'no, just wait, the IRS will take care of it'.

 

Now today I received a bill from the IRS for the $842.  I am certainly planning to call them on Monday, but curious what the advice from this community is.