Hey GodxEater1997,
Sorry for the concern here, as it sounds like you had quite a bit of progress on that PSN account.
The issue here is that there's no way to merge content from two different EA accounts. Unfortunately, it sounds like that was a misunderstanding. Cross progression allows you to access the content on a single EA account from the platforms linked to that same account. It does not let you copy or merge progress from one EA account to another.
The content you were accessing from that PSN account would have been left behind on its previous EA account when you unlinked it, because that progress is stored at the EA account level, not on individual platforms like PSN or Steam.
This is essentially how that would look:
EA account 1 - PSN account, Account 1 progress
EA account 2 - PC account, Account 2 progress
If you move your PSN account, you then have this:
EA account 1 - Account 1 progress
EA account 2 - PC account, Account 2 progress, PSN account
There is not a way to move that progress between accounts, although if you were to re-link your PSN to that original account, you may be able to access the content again. There's always a chance that link is permanently damaged and will leave the progress inaccessible or cause other issues whenever you unlink, but re-linking would be the only way to try recovering that progress.
Our support would not be able to transfer progress or grant content to a different account, but if you run into any issues re-linking they should be able to help get your PSN back to its original EA account.