Paid back sign on-bonus W-2c

Situation: 

- In 2021 June I joined and left in 2022 Jan and needed to pay back the sign on bonus since I was there less than a year

- On the contract i recieved 18.5k relcation and 25k sign-on. They asked me to pay back 57k with the breakdown shown: Sign-on: 25k, relocation: 18.5k, taxes: 14,202

I paid back the amount in 2023 and they said the following: "

• x will issue a corrected 2021 W-2 (W-2C) and will refund the Social Security and/or Medicare taxes associated with the overpayment
  • The W2c process can take 4-6 weeks
• x will adjust the applicable boxes 3, 4, 5, 6
  • Social Security wages/tax withheld and Medicare wages/tax withheld
• x will not adjust boxes 1 or 2 for the Federal taxes
  • Wages, tips and other compensation
  • Federal incomes tax withheld "

I then recieved about 4k in a check. 

Now I would like to amend my taxes to get a refund on the amount I paid back. I spoke to a live turbotax agent and they said that it does not make sense that box 1 for my W2-c is not chnaged. Please advise on how im supposed to proceed. 

Can I reduce the amount I paid back for 2021 or another year despite the box 1 being blank on the W2-C? 

Thanks