I haven't tried again since your reply to my post.
But I tried most of your suggestions without success.
I went through the telephone tree from that phone number several times. The last time when I got through the whole tree; it essentially ended with a message "not available".
I went through the internet to request a copy of my 2020 1040. It never came.
I found the phone number for the IRS Taxpayer Advocate in Columbia, SC, and left a voicemail with my phone number.
Very frustrated. Find it hard to believe that the IRS changed my tax return without any notification. It was only because I applied my refund to my 2021 estimated tax that I found out.
