We always recommend to link 2 social media accounts to your game account in order to avoid such situations. Please contact Twitter and try recovering your account.
@Cloudy @CloudyI need urgent help please. My account UID is .51233367463I have sent email to PUBG MOBILE CS@tencentgames.com but no response. I can't file a claim in game because it is in BETA. @Cloudy
The email for the customer service is service@pubgmobile.com, @cOLD | bedboy. However, the only recommended way to contact the customer service is through inside the game.