i can't stored value RP !!!!!!!!

i saw http://na.leagueoflegends.com/en/news/store/sales/extra-bonus-rp-here-limited-time so i went to bought Prepaid Cards . but when i back home ,

i discovery i can't stored value RP . The store show Redeeming . i wait three hours , then i still can not stored value . Now i feel so worry , i afraid wasted

my money . Who can help me ... plz..