Sale Skin Charged Double

When I purchased the sale skin 'Veigar Greybeard' the client showed that it took the full price 750 RP out of my account instead of the sale price of 375 RP. I put in a card and the next time I logged in it was back to the correct RP in my account so no harm done in the end. Just annoying. The guys at Riot said it was an issue with my account syncing with the servers and that I should put a discussion note up here. Adios Compadres.