Missing RP from Christmas Issues this year. "Invalid HTTP Response"

I got the "Invalid HTTP Response" error message for a $25 card but the message went away and it worked. I put in another code for $50 and it gave me the same code. This time it did not give me the rp. I tried to redeem the code again and it said the card was already redeemed. I don't know what to do and I don't want to be cheated out of $50. I love Riot Games plz someone help!