Xiaomi India — redmi note 5 pro/ regarding: unable to claim the warranty

Dear sir/madam,
I'm vigneshwaran. D. S i'm using redmi note 5 pro which i had bought on 13th august 2018. On 16th november 2018 i'm facing an issue with this mobile. Once the message popped up in my mobile screen that "com. Android. Systemui has stopped". Then the mobile got switched off, while turning on my mobile, screen displays only mi logo and it can't get open after that. After a long time it directly going for the fastboot menu.
I had visit my near by service centre to sort out this issue. They told the issue of the mobile was reboot fault after inspection they told your board is affected and it have to replaced. The cost of the board is rs.7, 078.82. I asked for warranty to repair this issue but they refused and said like this problem cannot come under warranty, and said that i have to pay the amount of rs.7, 078.82 for changing my motherboard for solving the issue. Service record id for your reference: wxin[protected]
Service center code: xm1n1896

My mobile is just 3 months old mobile still my warranty period has 9 more months but i cannot able to claim warranty. Please take this issue in warranty for replacing.
I can't even able turn my mobile on anymore. Please help me to sort out the issues i'm facing with this mobile. I'm looking forward for your valuable reply.

Details for your reference:
Name: vigneshwaran. D. S
Model : redmi note 5 pro
Invoice no: 165796
Invoice date : 13th august 2018
Imei no: [protected]