They sold me already used cards for Sony PSN. When I contacted their Customer Service, they asked me for proof that I have not redeemed the cards myself. I contacted Sony, who confirmed that the cards have been redeemed one month prior to my purchase on another account. I even got Sony to send me an official email confirming that. But no matter how much proof I provided, GameCardDelivery continued to ask me for more. I have tried to comply with every request they had and provided what information I could, but after a while it became clear that they were not acting in good faith. I ended up losing my money.