Need to Unlink Xbox Account from Old EA Account – I Have Access to Both

Hello, I need help unlinking my Xbox account from an old EA account. 
I currently have access to both my old and new EA accounts. The Xbox account is still linked to the old EA account, which I no longer use. That old EA account has no games, no progress, and I want to permanently unlink it. I want to link my Xbox account to my new EA account, which I actively use and where I have all my games and data. I've tried to contact EA Help through the support site, but I keep getting an error saying the page won’t load, even after trying different browsers and devices. Live Chat isn’t available either.  Can a moderator or support agent assist me with manually unlinking my Xbox account and linking it to my new EA account?
Thank you very much in advance!