From the IRS:
If you contacted your employer and still don't have your W-2, call us at 800-829-1040
This is July. If you were a W-2 employee your employer was required to provide you with a W-2 by the end of January. Getting the EIN will not help you enough---you need more.
W-2’s come from employers. There is not a federal or national website that provides W-2’s. If your employer is partnered with TurboTax to allow the W-2 data to be imported into the software you can do that---but you need the actual W-2 so that you can enter the EIN and the amount from box 1 to import the other data from the W-2---which just saves you the little bit of keying in of the other information.
Some employers have payroll sites that will have your W-2. You might need to phone, drop in, email and/or snail mail an old employer to make sure they know where to send your W-2.
https://ttlc.intuit.com/questions/2561916-how-can-i-get-a-copy-of-my-w-2
The form 4852 is a last resort. This is what the form says:
If you don’t receive the missing or corrected form from your employer or payer by the end of February, you may call the IRS at 800-829-1040 for assistance. You must provide your name, address (including ZIP code), phone number, social security number, and dates of employment. You must also provide your employer’s or payer’s name, address (including ZIP code), and phone number. The IRS will contact your employer or payer and request the missing form.
Because of this, you cannot e-file a return with a 4852, it must be mailed in. I hope you can make the employer realize they really do want to make time now to provide your W-2.
did you get pay stubs and did they show federal withholding. FICA or Medicare taxes taken out. If you got the stubs but they do not show this, it's likely your "employer" was treating you as an independent contractor. Rather than a W-2 they should have sent you a 1099-NEC.