Ultimate Game Card help please!!

I recently brought an Ultimate game card from my local drugstore. And I've been having issues. My card, is $20.00 worth, and I charged it, so I can redeem my Z8 points for the game CrossFire. As I attempted to redeem my "points", I had successfully charged $10.00 onto my Z8 Games CrossFire account. Shortly after, I attempted to purchase another $10.00 but, the services would not allow me, stating that I had already redeemed the code. And now it says I have a balance of $11.01 in my account, and I cannot charge another $10.00 because it will not allow me, and says that I already have redeemed the card.
Please help.

-Thank you.

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