rejected e-file

I e-filed my 2020 tax return before the deadline in 2021 using turbo tax. I did not receive an email stating whether my return was rejected or accepted. I used turbo tax again this year, but I did get a rejected message due to incorrect AGI. I checked my paper copies and entered the AGI several times after a rejection email.I then went to the IRS website and it shows there is no record of a 2020 tax return filed. I believe I should get a refund from turbo tax because I did not get an email either way. Now it looks like I have to file my 2020 tax return by mail. What is your answer?