Skins not working

Nothing better than spending $10 on my Mecha skin and not being able to use it! I'm not sure if this is just team builder or other modes as well but when i select my skin it doesn't upload to the game. This has been going on for weeks now and I thought Riot would have caught on to it sooner. I know it's the holidays so i don't expect any immediate response to this.. Would just like to get my moneys worth out of the game...