Xiaomi India — not giving repair mobile in warranty period.

Address:

Bardhaman, West Bengal, 713125

I have bought a redmi y1 (4/64) handset on 24th january, 2018. Few days ago suddenly this mobile network has vanished. I have also called customer care and advised me from there that to go local authorised service centre. But service centre not helped me. Told me set has been 'liquid damaged' and warranty not granted. But set is not any liquid damaged or sinked confidently says that.
Service centre also said 60% of mobile's price will be cost.
I'm harassed with this product.
Now what should i do???
Plz... Plz.😓😓