Can't unlink Xbox account from unknown EA account

Hey 937080d7525330ad​, 

Sorry to hear that there's been difficulty getting those accounts unlinked. 

Unfortunately, we aren't able to help you directly here on the forums, as we don't have access to account details or the necessary tools to make changes. I'm afraid you'll need to continue working with our live support team to recover that EA account and unlink your Xbox account, which will require verifying your account ownership with various pieces of information, including proof of purchase. 

If you don't recognize the EA account and want to unlink without recovering it, that'll also require live support's assistance, and the advisor you connect with will be able to explore the available options with you. Thanks!