Flipkart — ITDeck rejected replacement for product that is in warranty

i recieved OD[protected] ON 16th Aug 2014. i found that the product XFX XFX R7 260X 2 GB DDR5 Graphics Card was defected.. it shows some colourful lines on screen before installing drivers. and screen goes off while installation of drivers. The installation dose not even finishes..i tried 3 different high end computers to test the card but unfortunatly same results...now i claimed for replacement ...ITDeck rejected my return request with return id 7064654...the product i have purchased have warranty of 3 years... what a disappointment by flipkart...my trust over online shopping is gone...please what can i do to get it replaced. my rupees 10 thousand are getting wasted...i dint even use the product for once...