I am extending a courtesy warning that this type of thread isn't allowed in the Clash of Clans section which you clearly knew and pointed out in your thread.
Additionally, your thread is very contradicting. Did you scam someone or did you not? If you took something without paying, then you did. If so, then yes you should return it.
Just tell the seller if you actually did anything, signup for a playerup account and post here providing details on what you did and then at no charge we will assist you both at resolving this dispute.