Can't Access My PubG Account Through Facebook After Reinstalling It!

Yesterday, I decided to uninstall PUBG Mobile from my device and then reinstall it, hoping it would fix some performance issues I was facing. I had no idea that this simple action would result in a perplexing situation that has left me feeling utterly frustrated! After reinstalling PUBG Mobile, I eagerly tried to log in to my previous account. To my complete surprise, I discovered that I was logged into a completely different account instead! How is this even possible? I simply want to be able to access my own account, but it feels like an incredibly difficult task. In my desperation to resolve the issue, I made the decision to attempt logging into my account using the Facebook password that is linked to it. Surprisingly, PUBG Mobile has refused to acknowledge that I am the rightful owner of the account. Seriously, can you please just grant me access to my account already?