Karbonn — not replaced or mend my phone

Address:

Hyderabad, Andhra Pradesh

I purchased karbonn A15 on 26 march 2013(IMEI no. [protected]).After six months that is on 19 sep 2013 phone was dead and taken to karbonn authorized service center (sri sai communications, secunderabad). After one month they said " the phone was not in our service we cant do anything". I dint get what they said and all my tries are in vain. I have warranty of another six months, phone was completely dead which is to be replaced or make to work by the company or service providers. But they are still making me to roam arround the city. i attached service center receipt and my phone bill . i request you to help me in this regard . thanking you.