Nokia 5310 Xpressmusic — Phone complaint

I purchased Nokia Handset 5310 from univercell, Cochin, Kerala, vide invoice number PKMG 1902 dtd 22 Jan 2009 for Rs.8217.
After few months handset started giving problem & the same is given for repair at Nokia care on 1609 vide 506/10 at cochin.And I paid Rs.833 for change of component and rs.300 for labour.eventhough there were minor complaints on software as well as in hardware side,I neglected and used since 1 st week of October 2009.Yesterday Nokia service centre informed me that the set can't be repaired further.My complaint is eventhough I'm in the warranty period Nokia denied me the service and repair for unknown reasons as they claimed.This will force me to take necessary legal actions if I'm not awarded proper remedies.My sincere request to Nokia to look into this matter urgently and do the needful.If proper steps are not taken within 15 days, I'm bound to go ahead with consumer redressals.
Awaiting for your early reply is highly appreciated,

Regards
Jibi Sadsivan