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Unless there is an inerrant issue with the game all sales from the PS Store are considered final, there's no harm in asking customer support for a refund but they have no obligation to give you one.
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I bought a game that dosn't work, so I wanted a refnd for Uncarted 2 Among the theifs, to the cretit card it was paid through.
1) Where did you buy the game
2) What is the return policy of the seller you bought the game from?