I'm only vaguely familiar with form 843 and do not believe it applies to your situation (rebate of income tax withheld).
TurboTax does not support IRS Form 843
IRS Form 843, Claim for Refund and Request for Abatement - https://www.irs.gov/pub/irs-pdf/f843.pdf
IRS Form 843 instructions - https://www.irs.gov/pub/irs-pdf/i843.pdf
I don't think you have a do-it-yourself situation and if you want to pursue it, should consult a professional tax person.
the IRS has instructions on what to do if you receive an incorrect W-2 and the employer is uncooperative: https://www.irs.gov/faqs/irs-procedures/w-2-additional-incorrect-lost-non-receipt-omitted/w-2-additi...
I'm afraid that's the limit of my ability to help. You appear to be convinced you're right. I pretty sure it doesn't work that way. But, I'm not CPA.
