How to contact meta support as a developer?

I'm part of a small indie studio and we submitted a game to be reviewed for app lab 7 months ago. Nothing has happened and the game is stuck in review. We've had no communication from Meta, and we fear that something has gone wrong during the review process and the game will be stuck in review forever. 

How do we contact Meta support as a developer? Is there an email, phone number, website, ANYTHING we can use to contact them? What are you supposed to do if you have issues during the submission process if there's no one to contact and you can't do anything while the game is being reviewed?