Oneplus — Mobile damage

Address: 201010

Website: oneplus.net/in/support

Hi,

I bought one plus x mobile phone few months back for INR 17, 000
All of the sudden it stopped working.
.

I showed my phone at service center. They say its a liquid damage and asking for INR 14, 450 to repair when the new one costs 15000 now. I told them it never went into water.
They say it might have been due to moisture and I have to bear the charges.
It is under warranty
Why should I bear the charges if the phone got damaged due to its own(through moisture). They should not sell it in a country or city where there is moisture and should sell it only in cold countries if the device is so delicate.
After a month of complaining and follow ups, they are still telling me to bear the repair charges(which is equal to the cost of a new oneplus x phone). The phone got damaged on its own probably due to moisture, I need my money back.

They are neither refunding nor repairing for free.

I want my hard earned money back. Please help.

my case id is 84402