Code already taken

[MPappas2216]

So I downloaded sims 3 and played it and it worked fine. Then All of a sudden the game unistalled from origin. I tried re installing  it, but it says the product code has been already used (because i used it to download into origin the first time) 

The game is still dowonloaded onto my computer, but i cant play it because it is not on my origin account anymore. 

What do I do now? Do I have to buy and download a whole new game? 

[crinrict]

Are you sure you've logged in with the correct account ? Used your email instead of user name to login ? If so, you need to contact a customer support game advisor for this

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