The free Dreadknight Garen and Riot Girl Tristana Skins codes don't work.

Recently, a friend told me that you can get 3 skin/champions for free by Liking the Facebook LoL page and following the on Twitter. Ive mnaged to get the Unchained Alistar skin and champion but i cant get the other ones. I liked the FB page and followed them and my codes dont work. I get an error saying Something went wrong. Is there any way to get them in another way?
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