Cross progression bug

Hello,

I started playing apex legends on my ps4 in 2020, I had a lot of progress and purchases on my ps4 account. Then I wanted to start playing on PC and I didn't even know what cross progression was I thought it would be like fortnite where you can just switch consoles and stuff but I learned quickly there was no cross progression so, I just played very little on a different brand new account. Then, when I heard cross progression came I logged on trying to see it work out but then I loaded up and saw the same brand new low level account, not the one from my ps4 I was expecting.  Someone from EA support was able to find out I unlinked my account in 2023 and relinked it to a different EA account.  This is surely why I lost all of my stuff from my original account I used to play on ps4 in 2020. I went on my ps4 and saw that all my stuff was gone even on console, it actually showed the new account I played on pc before cross progression. I just want to get my original stuff back and I was told by someone from EA support the best chance I have at getting my stuff back is to relink the original ps4 account to the original EA account. Did anyone have any success doing this; is there any way to for sure get my progress back? I know now that there was a disclaimer saying there was a risk when unlinked accounts, it was my mistake for not paying attention to that.  

Thank you all