Riot point Pre paid card didn't work (Please Reply quickly)

When i tried to activate my pre-paid riot point card it froze for about 10 seconds and then told me that there was an error, i re-tried the card and then it said it already had been redeemed. I logged out of the client and tried it again but it didnt work. What do i do? PS. i tried my other $25 card and that one worked but i just got scammed of another $25 card.
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