Battlefield 4 product key invalid?

Please follow these steps to contact a game advisor directly for more help. There’s nothing we can do on the forum to fix this for you.

1. Click the link https://help.ea.com/en/contact-us/ask and log in with your Origin name and password.

2. Where it says: ’What Can We Help you With’, type in ‘Battlefield 4’ 

3. Click Find Solutions

4.  Select "Billing/Purchasing" from the drop-down list and also select your platform from the list.

5.  Click: Find Solutions

6.  Scroll down a little and on the lower right hand side, Click "I Still need Help" 

The Window Will Open... 
You’ll now see the available contact options, depending on your geographical location and the time of day. Phone or Live Chat are the best options. 
 

Hope this helps.