First of all, accounts never get deleted. So rest assured.

Even if such a thing happened, we have hourly backups of the data and can roll-back data to any point in the past 48 hours.

There is absolutely no way to connect Google and Facebook automatically, which is why every user needs to connect both accounts in the settings.

If you login via Google when it hasn’t been connected in the settings, it will create a new account that is connected to Google only. This can be fixed by logging in via the other service to your main account and then adding the Google connection to your main account.

I’ve looked at your account and it seems you have both connected now. That means you should be able to login via any service and it will lead to the same account.

Let me know if you have any questions left.