I cant unlink my old account

I cannot unlink my old xbox account from the EA account it is currently linked to. I cannot log into my old EA account because it uses a Yahoo email that was converted to a Gmail address. This change prevents me from bypassing the 2 factor authentication to get in my old EA account. The 2 factor authentication currently sends verifications to a email that does not exist. Please contact me to unlink my account or disable the 2 factor authentication.