I did review your taxes and you do not need to amend your returns either way. The threshold was not $150,000 for eliminating the credit, only reducing it. Your percentage of reduction was 0.1% which calculates to $3 (rounded). This is the most they can be asking for as payback if you were entitled to take the credit on your tax return. If you checked your account via the link I provided and confirmed the IRS does not show you received the 3rd stimulus payment (2021 payments were the 3rd payment), you need to respond to the letter that you correctly claimed the credit on your tax return. The letter has a section about if you disagree and wish to respond. You need to compile the proof of information and respond according to that guidance.
If the issue is that you actually did not receive the 2nd stimulus payment (made in late 2020), you need to amend your 2020 tax return and can see Recovery Rebate Credit for more information on claiming it. You will, however, need to repay the 3rd payment as requested in the letter as the IRS will not just "transfer" the credit amount between years or payments.
@LUCKYK61
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