i bought the sims 3 dragon valley but the code i was given was already used plz help me

Where did you buy the world? From Origin or the store on the Sims 3 website? You should see the world in your Purchase History:

http://store.thesims3.com/purchaseHistory.html

I am not the op but I have the same problem. My brother bought me the game from a Harvey Norman retailer. Got it home installed it and got this message. Guess someone has pirated the code.

You need to contact Customer Support for this

The AnswerHQ is about Users helping Users.

They can be found here: https://help.ea.com/contact-us/ask

Choose a category, a game and a platform for the contact options to show up.

If live chat is gray, change your country to US and make sure you're on US Business hours. It might also gray because they're very busy. Try later.

See this post if you have trouble with the site: http://sims3.crinrict.com/en/2012/10/how-to-contact-ea.html