Consumer Redressal

I had purchased Samsung mobile on 08/11/13 & its starting overheating problem within one month of purchase. When first visit to service centre to resolve the problem I submitted the handset on 06/12/13.service centre person said that there is a motherboard issue & it has to be replaced and they done it. when I received the handset back on 13/12/13 within three days same problem happens again. then I called to customer care & they told me to visit the service centre again so I visited the service centre on 20/12/13 & submitted the mobile handset. same day I got a call from service centre, they told me that there is again motherboard & touch panel issue & has to be replace again. I told the service centre & customer care that I do not want this handset as it is getting problem again & again, but they are not giving me the replacement. Please help me in this matter... Regards, Rakesh Punjabi