I can't link my main PS4 account to my Steam account.

Hi, I came back to apex legends when i knew that cross progression is here. I was mainly playing apex on my ps4, and reached level 274. Then i transferred to pc and played the game a little with a new steam account a year ago just to link my pc account to my ps4 account and use the ps4 account as my main profile. So, I tried linking the accounts but my ps4 account is linked to an anonymous EA email, i thought it was my brother's since he plays on the same ps4. But i noticed that his email is not the same as the linked EA email to my ps4 account. I tried entering apex on my ps4 and it got the right profile with my all my items. So i concluded in my head that someone linked his EA email to my ps4 account (who i don't know), and now, I have no access to my ps4 account on EA, so i can unlink that email and relink it to my main email. Please if anyone can help, please do so. i can provide full info and evidence about the accounts, game profiles, and even old footage of gameplay since the game was released.

Thanks.