Will i still get a refund if my job has not taken federal out of my checks? I have tried 3 times for them to take it. Sept is when i asked for 40 out of each check.

I noticed in sept where i work was not taking federal out, they kept saying sonce trump he was not doing federal but everyone around me has been getting theres out. I have changed my W2 3 times different way and still get same result. Now when i do calculator it says i will not get refund this year.