This is something I would kick up a fuss over, even better if you weren't the only one affected. While there probably isn't anything you can do legally you may be able to get the company to see things from your perspective. This isn't wishful thinking either, I've been in a situation where we were able to negotiate for additional compensation after loss of RSU.

I try to talk about it with management..I was basically brushed off..I'm scared of being layed off bc the company has recently done a few rounds of layoffs..

Unless you really value the company, people, execs, and mission there I’d keep your head down and start interviewing elsewhere.

If you do really like it, I think there is a risk when bringing it up but you should be able to find a compromise with them somehow (more $$$ within X amount of time if the company is in a better spot).