sent a broken ps3 back to seller he isnt issuing a refund

bought a ps3 which he said works excellent for me to get it and its broke ive now returned the item he isnt issuing a refund claiming its a different ps3 when that was the only 1 i had 

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Have you actually opened a case, if so what sort? Some information does help as if you have not done things properly any advice given may be completely useless.