i Got Scammed by a gift card. HELP!

Yestesday i buyed a league of legends code from a trusted store, and it didnt work, saying that it was already used. So i comeback to the store that i buyed the code and they tell me that they couldnt help because the code was already scratched. I have all the proofs i need, so they tell me to contact riot games so here i am. If someone already had this problem before pls help me. Its just a 10 euros card but its a waste of money. If requested i can send the code and the invoice. thanks for the time
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