Sorry to hear. That's a huge hit. As I've suggested others do here, sign up for an account at IRS.gov. You need 2 forms of ID (i.e. drivers license and passport...
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 ...
You are not alone in this Rebate Recovery dilemma. I answered NO when TT asked about the 3rd stimulus check - I never received one. TT still put $84 in line 30 ...