Employer refuses to report wages to IRS

In 2021 I finally received my W2 via my email from my previous employer, I filed my taxes. My refund is still being held 3/2023 due to them never reporting to IRS. I spoke to them about getting a letter with the information my tax advocate needed, they said they would get it sent to me the following day, weeks ago. Since then I can’t get my calls answered or texts responded to. What do I do?