It depends upon what you want out of this. If you just want to mess with him, a couple of well-placed threats to his loved ones work wonders in breeding paranoia, but it won't buy you anything long term.
I'd capitalize on the disgruntled fanbase rather than hit Davis directly. They're all unhappy about something on the show lately, right? Going public and convincing the fans that you, too, are upset about the problematic aspects of the show puts you on their level. They'll like you. Talk about Malia's lack of agency. Discuss the lack of acknowledgement of character death, the constant revolving door of actors, the thousands of plots they're dropping. I'm thinking YouTube channel and public appearances. Can you cry on command? If not, I can teach you; it's not difficult. You'd hit Davis in the ratings rather than in the face.
And when he calls you weeping over his stale coffee because MTV is moving his once-proud show to the dreaded Sundays-at-6:00pm time slot and wanting you to call off your dogs, that's when you get to let the extended evil laugh really go, and hang up while he's still begging for the mercy that you'll never give him.