check your emails for the codes login to your origin account if you don't have one download origin create an account use the same user name and password as on the sims 3 site
if you still have issues with your codes then contact CS
They can be found here: https://help.ea.com/contact-us
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
