The account of one of my relatives was hacked in a password breach recently and I've been trying to contact any support representative at Facebook for over 2 months. We noticed this within 5 hours of the hack happening and the email being changed.
I've filed support tickets with Oculus using my own headset's serial number - no response. We've been through every Facebook "help" page you can possibly image (ID checks, hacked account support, responding to security alerts) - got automated responses of absolutely no help. I've even reached out to people I know personally who work at Facebook and, of course, no one seems to have any idea who to talk to.
Turns out there are no support reps for dealing with deleted accounts. That should tell you all you need to know.