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Sorry but I am totally confused by all IRS instructions, can't reach IRS.. pulling out my hair. would appreciate info if possible.

I received first stimulus check, no problem.   

Kept hearing info that IRS would send Credit Card for second stimulus.. did not get !

I am social security recepient do not pay taxes so I went ahead and filed my 1040SR but indicated I had not received my $600 stim... of course 2 days after I Electronically filed taxes.. I got $600 check in the mail.   Since I had already filed asking for the 600 on return, I returned the 600   to the IRS marking it void/duplicate..

Now a couple days ago I received an adjustment notification from IRS saying I made an error and they corrected it to a 0 money coming to me... Notice CP13.. and 18H code..  I called the IRS was told to fill out a form 3911..  Then I had a returned call from the IRS and was told that I needed to file a 1040X form.. NOW I can't reach anyone at the IRS and they are not returning calls

Totally fustrated and confused