SPICE MOBILE MI-479 NOT REPAIRED SINCE 03 FEB 2015

I buy Mobile Hand set ( Spice Mi-497, imei no 911384650156900) on dated 24 Nov, 2014 on 03 Feb 2015 this set gone dead and I submitted at service center shakarpur, Delhi. SR No 30100144F20038 . Problem is not resolved. service center resend this set again on dated 04 April 2015, SR No. 30100144F40102 again Problem not resolved resubmit by service center vide SR No. 30100144f40329 on 13 Apr 2015, problem not resolved again service center resend this mobile SR No 30100144f40451 on 29 april 2015 this set resend by service center on same job no. please resolve this problem