Sims 3 Island Paradise Serial Code

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the sims 3  website wont let me redeem the code and it is saying that i don't have the game and i do

How did you buy it ? On DVD or as Origin Download ?

See if this helps you

http://answers.ea.com/t5/The-Sims-3/FAQ-Invalid-and-Used-Serial-Codes-amp-Games-not-showing-up-in/td-p/194028

i boght the game and the code won't work can i please get a new one

For new codes you need to contact a game advisor.

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Game advisors can be found through live chat.

1. https://help.ea.com/en/contact-us/ 
2. Click on the orange NEXT button
3. Select a platform
4. Click on the orange NEXT button
5. Select a topic and describe your problem in a few words
6. Click on the orange NEXT button
7. Click Chat Now to chat with a Game Advisor
   

In Details here: How to contact a Game Advisor using the new EA Help page