Yeah, I've tried that angle as well, but unfortunately, they either don't care or they're not interested in really doing anything about it. Unfortunate, but that's just the way people are these days, sadly.
I did just deactivate my Facebook about an hour ago. I figure that Messenger is still available if they need to get in touch but otherwise, it will keep me offline, save me some time, and hopefully send a message that I'm not really interested in keeping Facebook in the long run. Doubt it will do much of anything, but I guess we'll see.