You will need to provide accurate information to the questions asked. Inaccurate information may cause your request to get rejected as mentioned by the customer service, so make sure to double check your answers.
It is also really helpful to submit claims on a device you used frequently to login to the game. If you no longer have access to this device, it may be helpful to mention why on your claim.
Please reach out to the customer service via in-game or by sending an email to service@pubgmobile.com if you need help regarding the in-game recovery tool.