Warranty not taken seriously

Hello there guys.I've purchased a mobile phone in January. Until 5 months, I've had no problems, but now the Sony Ericsson W910i which I purchased from this ebayer situated in UK is restarting randomly, occasionally freezing, also when I have a call and open the phone to answer it, the phone switches off.When I purchased the phone he told me that the phone has 1 year warranty from the UK. Now i contacted the seller (powerseller) and after about a weak he told me this:heysorry for late reply.i am sorry to say that i do not have warranty card with me becaz i change home and lost it some where else,so plz try to sort out this problem ur self. have good time ***** (name)This is not fair on me because I have warranty on the mobile and the seller is refusing to contact me again or refunding.What should I do about the mobile doing such things and about the thing? How could I file a claim to be refunded or so? I hope to receive an answer soon.ThanksRegards,Francesco

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