Hi,
I have changed my GamerTag on my Xbox360/One account, but my origin account keep the old gamertag.
How can i change this ? On the account managing we can't do that, and i can't be called by ...
You can try to contact an Ea advisor with "live chat" option. If live chat option is not available on your region you can set "United States" as language on top right corner of ea help home page.