My employer has not responded on providing the experience letter for ACS employment verification

I had to go to fairwork for them to release my final payment so they are now not responding to my request for experience letter. They won’t provide any refusal letter too. What can be done in such case? Can I take legal action against them?

Usually, it’s not easy to get this kind of letter by fighting through court.
Try to get any of you co-worker to write the letter.