how do i resell my bf4 pc game

Look inside on the link, on de authorize, http://activate.ea.com/deauthorize/

Actually once you registered the disk to your account,the disk is link to your account permanently,

de authorize only allow it to be use on another computer,up to Max of 5 consoles.

If you sell it off,the new owner will not be able to play the game unless new owner have your account details ,which will enable new owner to use it for gaming as the disk serial code is link to your account.

Will be much easier to get a refund or you can speak to EA advisor about it!

AHQ a Public forum ,since it would involve accessing your account to verify which we cannot do in AHQ(the policy of the forum forbide personal information to be post in here .for eg,email,password,DOB,..) .In order to solve your problem you will need to speak with at game advisor at EA Customer support:  https://help.ea.com/contact-us 

Did you meet the conditions for a refund : https://help.ea.com/sg/article/returns-and-cancellations

You can find more information here: https://help.ea.com/article/what-s-the-great-games-guarantee

http://www.origin.com/news/origin-great-game-guarantee

Check this link for Warranty Exchange policies and procedures.

https://help.ea.com/en/article/electronic-arts-warranty-policy

For any issues regarding accounts/refunds, please follow these steps to contact a game advisor for more help:

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 ‘GAME NAME’

3. Click Find Solutions

4. Select "Your problem,eg accounts" 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"

Picture to help you understand better,  https://help.ea.com/article/welcome-to-the-new-and-improved-ea-help-center

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

For customers in North America:

• Select "Call me."
• Enter your phone number.
• Select "Submit."

For Customers outside of North America:

• Go to the "choose a contact method" section
• Contact us using the telephone number provided within the listed opening hours

Please be aware that it is likely that the agent you speak to will need to confirm information on this account.

Hope this helps
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***Please note...I do not work for EA/Origin. Questions belong in the forums,Solution is like medicine,same medicine/solution may not work on same problem

I don't answer questions via PM.  AHQ is "Player-to-Player" technical self-help forum