Hello,
Please rest assured that moderators would not steal your account. You can retrieve your old account via the methods below.

If you have a phone number or security email linked to your account, or know your security questions, you can recover it through the account recovery tool or by creating a CS ticket in game or in your user center. Here are the links to the two platforms you may use. Please keep in mind that recovering your account by creating a ticket will require more stringent information checks.

If you do not have any of this, you can attempt an appeal through the Customer Support ticketing system.

Appeal:

https://profile.oasgames.com/web/reset-password/get-user-name?lang=en-us

Customer Support:

https://support-center.oasgames.com/

You seem to have implied you already tried an appeal of some sort. If that is the case, and the appeal was unsuccessful, that unfortunately means that you were unable to demonstrate true ownership of the account. I would recommend trying the appeal or ticket again and ensuring all provided information is correct and accurate.
Hope this helps!