Lost Nightringer (Yasuo) skin in Night and Dawn event

So I bought This Pariah Chroma (Nightbringer Yasuo) + Icon with 300 Night and Dawn and dawn token last night and when i bought it i didn't have Yasuo (Champ) yet and when i refunded senna when i came home from school today to finally buy Yasuo and try to enjoy the skin in Summoner's Rift I realized that the skin is gone and i feel really bad about losing the skin since its my first skin. So can anyone help me about what to do or what exactly happened here. I already reported this to Riot as a bug pls help me i really liked that nightbringer yasuo skin
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