2 Champon are gone -.-

Hey everybody : As i was in Champion-select i've noticed that 2 of my Champions are missing...(Zed and Yasuo) They were gifted to me by a real-life friend about a month/a month and a half ago. Now they're gone as if i never had them. In my gifting history they're shown as if i had them... I dont know what to do...i didnt receive any message from Riot telling me why they did take them away... I'm just pissed right now ?ecause it actually is like they just take money away from us. My friend spent money to buy those champs for me ... Can someone Help pls... My english isnt that good sry.
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