Xiaomi — motherboard failure

Address:

New Delhi, Delhi, 110077

I put my redmi note 4 on charging with its original charger.
After some time when i checked my phone i discovered that it was not working. The very next day i visited the mi service center as my phone was under warranty. They told me that they won't cover motherboard under warranty and told me that it repair cost would be around 11, 030 rupees. I decided not to go for repair. Plus they asked me for another 118 rupees for service charge.
I am really unsatisfied with their services i bought this phone on 3rd of april, 2017.
I don't understand what was my fault in this i never charged my phone with any other charger.
I hope that consumer forum will act on this as soon as possible.