Hey d0evils_agent,
Progress is stored on the EA account level, not on individual platforms like PlayStation, Xbox, Steam, etc. This means if you link your platform to a different EA account, you'll lose access to that progress.
I'm afraid there is not a way to transfer progress from one account to another. Additionally, keep in mind that each EA account can only be linked to one account from each other platform. That would mean once a PSN account is linked to an EA account, you would not be able to link a different PSN even if you unlink the first.
If you're having trouble accessing your own EA account, you can contact support directly so they can try to verify and help update any necessary account details. If that was instead linked to someone else's EA account, they would need to reach out to support instead.