Sony India — sony z1 display got no light ( water droplets got inside)

I am using sony z1 and my warranty just got expired last month, I have used the phone to take couple of photos under water and all the ports was clased at that point of time, took some pics and came back . On the way back home the phone just stoped on a sudden . When I reached home I saw some droplets indise the ports . I kept my phone aside for a day to dry and I switched on .display was dim no light for the display . I can use the ph by using other phones light . Touch and all are working ... my complaint is that I use the in water and not more than 1meter and my phone is unable to use . I want to file a complaint against your company . And sony service centre is not repairing or replacing the display and we are forced to buy a new phone at a 20% discount rate . I thing this is a strategy of the company to make the customers stay on to the company . I need to get my phone repaired by the sony