When I called USCIS to expedite my case the level 2 rep completed the request but a few days later I received a letter saying there's no expedite processing for DACA. I had letters from my HR and my manager but it was still denied. Many of us have had the same outcome so I'm not sure if it actually helps or others who do the same just happen to get approved around that time. I think ombudsman, congress representatives and NILC help a little more.