Consumer Redressal

i bought a sony viao laptop on 25 january 2012 ,one fine day it stopped working all of a sudden , on taking it to sony service centre they told me that the mother board and daughter board of my laptop have caught rust due to mostiure , which is weird since i live in mumbai and i have never heard of anyone facing this problem,and they gave a repair cost of 23000 ,almost half the price of my laptop which was purchased for 55000 . When i told them that this is not my fault if u have used faulty products in the laptop and i will not pay penny , they called me back saying they would do it for 20000 , and when i told them give me reason why should i pay for it they couldn give me any reason since they knew it is not my fault , they called me and gave me a reduced cost of 13000, but what i fail to understand is that why are they taking a consumer for a ride and why should i be punished for sony using wrong products. i have decided to file a consumer complaint against wrong etics of SONY