Same just happened to me and a friend in my clan. Our Cayde ghosts came which we mainly purchased for the emblem. Input the code and got the message "already used this code on your account". We both already have the Carrhae too so this would explain it.
Seems to me that this code has just been stuck onto the slip and is actually not a code for little light, not sure who to contact about it either.
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Tried entering in my Little Light code last night and had the same thing happen.
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I contacted the store that u bought the ghost shell from and they sent me a proper code for little light. Might be worth emailing the place you got it from see if they can do the same