I lost my Sims deluxe edition serial code

See if this thread helps you: http://answers.ea.com/t5/The-Sims-3/FAQ-Lost-and-broken-DVDs-and-missing-serial-codes-What-to-do/td-p/14230/

If not, you need to contact customer support

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