Call of Duty Black Ops 4 Support

i just bought 1 laptop with a redeem with Call of duty black ops 4, and said my code is already taken, i tried every single step but it doesn't work and the game was in my account for 5 minutes and after disapeard and it's only showing me to buy the game, how i can fix this, if anyone know please let me know, thank you.

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Registered: ‎13-12-2018