Same thing happened to me as well. I just upgraded PUBG VN version and after restart and login with my Facebook account all my profile is lost. It looks like new fresh account (see below screenshot). I lost my level, league, skin, UC, RP, achievements, friends everything. I was continuously buying UC from season 4-7. I was on RP 82 on this season. Now it is 1. What is happening? PUBG support is useless. I sent bunch of emails. No one replies. I just received below canned response.
ello and thank you for messaging!
For a faster and more effective way please contact us directly through the in-game support!
Go to settings from your game -> Tap on the “Help and Support” -> Tap at the top right corner the message icon and fire away!
Hope to hear from you soon!
Kind regards,
PLAYERUNKNOWN'S BATTLEGROUNDS MOBILE Customer Support