Sony India — Sony xperia handset

Address:

Raichur, Karnataka, 584101

Respected Sir,
I purchased Sony xperia z5 on 03/05/2016, as per store manager told the product will be one year warranty from the date of purchase, now my handset have some problem I visited to service center but they are saying that it's not under warranty that to still 1 1/2 month is remaining n wt he's saying means the handset has already activated in the year of 2015 but when I was purchased it's a box piece that to I purchased on may 2016. I've attached the bill here plz check n give me the solution whose fault it's, if not then I'll register a case in police station or in court on both Sony company as well as the store Please give me the response as much as possible.

Thanking you