Sorry to hear about your problem. I was sure I put NO on the question of if I received a 3rd stimulus check. I even went thru all my bank records in early 2021 and NADA - no stimulus checks deposited. But still, TT put $84 in line 30 and I missed it...but the IRS caught it and I got the "letter".
I suggest (if you don't already have one) you get a login to IRS.gov. You need to go thru a lot of verification thru ID.me, but once you can get in, you can see what you owe, and different payment plans are offered. I still think it's a bug in TT.
