Consumer Redressal

Hi, I have given my Nokia lumia mobile (N610) for servicing reporting a problem of automatic reboot in Nokia care \"Global Cell World, Malakpet, Hyderabad\" on 15/02/14 with job id 140212/48 ESN no: 359313048227056. The service representative was Mr Sai. Except for the phone rebooting automatically everything else was perfectly fine. Initially they returned the phone after saying the problem is fixed. But it was not and I had to return them back. They did this twice, with same problem not even fixed. After that they called me up and mentioned the phone cannot be repaired and the motherboard is dead. Now the phone is not even starting which means the phone which was functionally working with a reboot problem is now dead. Its more than 3 months now the problem is not fixed and they are not even promising a date to fix the problem. I am having mental stress over this. Please help me to get a compensation or get my phone back in the same condition that I have given to them.