Sony India — Motherboard Problem

Address:

Hyderabad, Andhra Pradesh

I bought Sony Xperia M dual in February from flipkart the phone was working nice but suddenly it got wet one day by mistake from that day its not working properly. first i got network problem as network was not detecting by phone so i went to service center and get it repaired though its in warranty they said because it got wet we don't repair on warranty. After repair i got network but my bluetooth & wifi are not working again i went to service center then they said that there was a problem in motherboard they have to replace it but it will charge Rs.7000. I have warranty and its just few months old phoe how can the mother board get damaged so early. i want that it should be repaired in warranty.