What do I do when my employer refuses to give me my tax forms.

the procedure is to contact the IRS but getting through this time of the year is difficult and may require many attempts so a visit to TAC office may be in order. 

see this link

https://www.nerdwallet.com/article/taxes/havent-received-w2-take-steps 

1. Call 1-800-829-1040 between the hours of 7:00 AM – 7:00 PM local time.
2. Press “1” for English or “2” for Spanish.
3. Press “2” for “answers about your personal income taxes.”
4. Press “1” for “questions about a form you have already submitted or a payment or to order a tax transcript.”
5. Press “3” for “all other questions about your tax history or payment.”
6. Press “2” for “all other questions about your tax history or payment.”
7. Do not input your Social Security Number when the recording tells you to.
8. Press “2” for “personal- or individual-tax related question.”
9. Press “3” for “all other inquiries.”
10. Wait to be connected to someone at the IRS.

If your employer will not issues the correct W-2 you can follow the steps here to get a form or file a return with correct information. 

At this point, if you did not file an extension, you will need to file form 4582 which means you will need to print and mail your return.