Since filed with Turbotax, my tax returns were not processed

Hi,

 

I started using TT in 2019. I submitted my 2019 federal tax return on 3/7/2020 (was accepted by the IRS the same day). When checking the IRS transcript - I see that my 2019 tax return was not filed (I am marked as non-filer). Same thing happened with my 2020 submission.

Today, I received a CP80 notice, mentioning I have a credit (the same amount I paid for 2020 for the federal taxes I owned). Of course that the IRS is not responding - impossible to get ahold of them via phone. 

What should I do to fix this?