titanfall serial key missing

EA does not support the re-registration of used games, sorry.

surely i can purchase a code from ea ?

I have no idea, really.  This is Answer HQ, where the community is game players.  You can ask a Game Adviser, but I caution you not to wait.  The weekend is when almost none of them are on duty (in some regions, none at all).  You want to call before 6:00PM your time, and here where I am, it is now 5:30 Central Daylight Savings Time. 

https://help.ea.com/ 

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@topgzr wrote:

surely i can purchase a code from ea ?

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@topgzr 

Answer HQ sells nothing, supplementary code numbers included.  You were referred to the Help Center.