Consumer Redressal

I bought a Sony Xperia Z3 compact phone from the Sony Centre in Mumbai on 14 January 2015.The phone started hanging from the third day of purchase. In the past 40 days, the phone has malfunctioned 4 times. Whilst I reinstalled the Android software at home twice, I once gave the phone to the Sony Service Cnetre on February 3, 2015 where they reinstalled the Software. The phone has been given to the Service Centre again on February 25 and it has still not been returned to me, despite the fact that the Service Centre feeling that there is nothing wrong with the hardware. I have requested them to replace the handset, however they are unwilling to listen. The warranty is nothing but a scrap of worthless paper as it does not entitle a fully paying premium customer (I paid Rs. 40,000 for this flagship phone) to any semblance of service or satisfaction.