Sony Mobile — defective phone sold to me fraud

Address:

New Delhi, Delhi

I just bought a new sony xperia z2 and side panel were loose so i took the phone to service centre and they took 10 days to repair a side panel but after few days o[censored]sage of my repaired z2 phone same problem still exist. its just a month old phone how can i accept a defective peice for 50, 000 bucks.i dont know what to do i have asked for a replacement unit kindly suggest something what to do...