You committed to this team, you should stay with it until your commitment is over.
This is always my default, but it also appears that they were made promises that are not being kept. To me, that coach is violating the "contract," so to speak.
I wouldn't walk away yet. It's only a few games. But if you're told A, B and C, and the coach is actually doing D, E, and F and there's no evidence of that changing, I think you're well within your rights. You were sold a bill of goods.