What can I do if my previous employer doesn't provide corrected W2 for me?

The number in my W2 Box 1 from my previous employer is not correct. I contacted the HR many times but they just ignored my requests. I contacted IRS and they said they will send a letter to the employer. What should I do if my employer still ignores my request and IRS request? Can I input the correct number in Turbotax directly? Can I still e-file my federal tax return and state tax return? Thanks!