No one listens to you if you verbally complain. They say they do, but they really don’t. They’re just waiting for you to be quiet so they can disagree.
The best way to complain is to make things.
If you make things, you hardly have to speak. You let your work speak for itself. And no one, no one, can disagree with something right before their eyes that shows them that your complaint is warrented.
If you want to complain, get to making something. Don’t speak.