Stuck on Mobile Pairing with Code Number

I am only posting here as I cannot find a way to contact Meta directly for support.
I have had a quest 3 for about 16 months. Worked fine for the most part. Sudden;y went black with fan running. Hard reset fixed that but now it wouldn't connect to BT headphones. Did a factory reset (headphones and headset). 

Now the **bleep** headset won't pair with the meta horizon app. It asks for the code to pair during setup but won't pair. I can see my headset details with serial number on the app. I can't seem to delete it and set it up again. I've uninstalled the horizon app and reinstalled it on my phone, still no fix.

When I try to go through Meta's godforsaken 'help centre' ('help' my arse) it just keeps bringing me back to the support links and when I put in my headset serial number it says that isn't recognised. Nor is my email address...even though I log in with that same email.

Anyone know how to simply contact Meta!? Like, actually phone them, live chat, or email contact????