STILL WAITING FOR STATUS OF 2020 RETURN

I filed my 2020 federal taxes on Feb 23, 2021. I still have not gotten any information since it was accepted. I have been trying to find out what has happened. they sent me a notice on 6/9/2021 and I corrected the error and sent the form back. Should i. resend the form in case they lost it. I have been calling with no success since last May with no results or ability to talk to anyone yet. I realized they are backed up. any suggestions. Thank You.

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