How to get store manager fired?

So Obviously I work for GameStop

But how do I get a Store Manager Fired because he treats us all like garbage

I have Physical Proof on how he treats us and how he treats the store

I have talked to (well left voicemail) to our regional managers but haven't heard anything back yet but have heard he wants to get rid of our manager

It just hurts me to see a GameStop I grew up with get run into the ground