Sony India — broken back panel of new xperia z3

Address:

Lucknow, Uttar Pradesh

i have purchased xperia z3 on 4th april 15.Today I took my phone out of my pocket and the pack panel of phone i cracked.I had loose pocket as i was wearing formals and i put my phone at front pocket.i had purchased many sony phones but this is the first time i am facing such problem. so this is my request kindly replace my phone because this is not my fault.