Micromax — new mobile not get back from 2 months

Dear Sir My Self Prem kumar as I had purchased a mobile handset of micromax company model MX A114 BLACK on dated 12/5/14 from mobile store limited shop no 11 ground floor market pocket-II, sarita vihar delhi having invoice no 41857/11198020 with INR 11200. but after some days ther is software & charging jack problem, same will be informed on 17/6/14 to service centre M/S K.S. mobile (ncr) plot no 7, FF, central market, near old bus stand, opp. Sihani chowki, gaziabad but till date we have not get back our mobile phone. the complaint no registered is [protected], we have tried so many times to service centre but no positive response from till date, everytime we will get a commitment of 15 days to get back the phone. Iam attaching the scan copy of service centre submission form, please do needful either they replace with new one mobile or get back my amount .