i forgot my security question on origin and i can't change my name.

Follow the Steps to contacting an EA Game Adviser to fix this :

1 Click here to go to the EA contact page. http://help.ea.com/en/

Note: Top left pick your Country :]

2 Select your game and platform, Then click next.
3 Select a topic and write about your problem.
4 Click next and select your preferred contact method.
5 Ask for a callback if you can as it is fast when I used it.

Or use this

You can contact EA here: http://help.ea.com/en/contact-us/

http://help.ea.com/ca/article/welcome-to-the-new-and-improved-ea-help-center/#contact