The irs states that my emploer never sent them tax info on me and are holding my return.

I filed my taxes Feb 22, 2019. The IRS has sent me 2 letters. After 10 calls to them they tell me that the reason they havent issued my return is that my employer didnt sent them my information. There are 2 other employees for the company and the employer states that they sent them in with the other 2 employees.  Both employees have received their refund. What can I do?