Nokia India — mobile phone stopped working

Address:

New Delhi, Delhi, 110056

I brought a nokia 7 plus mobile on 12 january 2019 from amazon for rs 24999. Then the glass screen got cracked and i had to replace it from a repairing shop as the nokia workshop told to wait atleast 1 week before getting it repaired and i needed my phone urgently as my mbbs exams were near.
Now the phone stopped working and the workshop now told that i must pay rs 8000 for a new motherboard and battery even as the device is under 12 month warranty
Since it is the original parts from nokia they must replace it without charge
Kindly take necessary steps so that my phone is repaired as i cannot afford so much money