Need For Speed Most Wanted activation code already in use

You will need to go back to your retailer and ask for a new code as he is eligible to give  you one in this matter but if he cant help then 

For this you will need to contact Origin/EA support they will gladly help you whit this problem https://help.ea.com/en/origin go here press contact as give information press I still need help at the bottom of the page and then press start live chat and you will get a live chat whit an EA agent that will be glad to help you

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Thanks for the fast answer.

The retailer was something like a Supermarket, so i don´t think that they are able to give me a new code.

I cannot see the " I still Need help" button. Will it appear again after Christmas?

Ok if you don't understand the steps  above try this steps as they are a bit more in detail 

1 Click on the following link: https://help.ea.com/contact-us
2 Make sure you are logged in (top right corner)
3 Click on the blue button "Contact a Game Advisor"
4 Enter the name of your game or product (or "Origin" for account-related issues) and click "Find Solutions"
5 Select the type of issue and the platform you play on, and click on "Find Solutions".
6 Click on the blue button "I still need help" if the FAQ articles do not apply to your situation.
7 Select a contact option. Note that you may get different contact options depending on your country.

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Maybe it could help, but when I try to do the steps you told me to do, the happy holydays- website appears. Maybe I just need to wait until the 26th. Then I will see if your solution works.

Thank you.

Go here and see what time they will be available https://help.ea.com/article/wwce-holiday-support-availability

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I´m still trying to start a live chat with an advisor. When I know more, i´ll let you know.

I'm not sure if you got what you needed, but I'm going to have to say EA's customer support   I lost my activation code, and while I understand it's my responsiblity to keep it, the game is 8 years old.  And because it wasn't registered like it is today, they didn't even want to help me for an activation code so my kids can play it.  I'll NEVER buy an EA game again.  I was told a supervisor can't make the decision (and was told one was not available).