Hey
With serial codes stating they're invalid, you most likely will have to contact EA, they can be found here: https://help.ea.com/contact-us
Please keep in mind that if you bought the game off Origin, it is AUTOMATICALLY registered FOR YOU!
For more info, please see these links:
http://answers.ea.com/t5/The-Sims-3/FAQ-Invalid-and-Used-Serial-Codes-amp-Games-not-showing-up-in/m-p/194028
http://answers.ea.com/t5/The-Sims-3/Information-How-to-Register-The-Sims-3/m-p/387162#U387162
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