On my Xbox 360, I first played FIFA 13 on my gamertag that did have Xbox Live Gold. This was a one-time thing, so I made an account and then completely forgot about it. I forgot all the passwords, and there is no way to recover it. It didn't really matter anyways; that account had nothing on it.
But when I bought FIFA 14, I couldn't play on my Gold account because I forgot the password, so I played it for a while on another gamertag. I got some stuff before I realized I couldn't play online without Gold.
So my question is this: How can I unlink accounts from gamertags, if I don't know the password?