Unable to access old EA account and can't link new one to Xbox account

So basically, a long time ago I had an EA account, that account was linked to both my Xbox account and an old yahoo email. However I can't login to that old account, I can't delete that old account, and I can't unlink that old account from my Xbox account. I can very easily prove ownership of the Xbox/Microsoft account but I just have this dead link to nothing that I can't remove. 

To preface again with emphasis, I cannot access this old EA account, no way to recover it as both the recovery email and recovery phone number are over a decade old and no longer in use/deleted. How can I unlink this dead account from my Xbox account? Do I have to ask Microsoft to do it or do I have to go through EA? It's really annoying trying to play EA games and not having access to things because an old dead account is linked with nothing for me to do about it. 

Edit: Some additional info, I have already tried to link this new EA account I am posting with to my Xbox account and it won't let me as it says the Xbox account is already linked.