Nokia 6300 — Phone irreparable

Hi,

I have bought Nokia 6300 mobile 2 years back. Recently all of a sudden it got switched off and not turning on at all afte that. I have aproched one of the Nokia Care Centers in Chennai.
They intilally said that its S/W problem and it wil cost Rs 850/-+ Tax. I accepted that and given to repair. But When I went on next day they said the mobile is not repairable as S/W is not getting loaded because of liquid lock. This disappointed me a lot. It never exposed to water or sweat, when I said the same to them they said they cant do anything. I bought it for around Rs.10, 300/- and it just came for 2 years. Is there any help I get on this. Please guide me.
Follwoing ar ethe detaisl :
Mobile IMEI code: [protected]
Job sheet No at Nokia Care:[protected]/090708/11

Thanks in Advance,
RajKumar/