Vox Kick K8 — Vox kick k8 has sound (Mike) problem and battery down in half and hour

I am Mahesh.M. I have purchased a mobile (vox kick k8) from your store. Unfortunately I h ave to say that the mobile has defects from the day of purchase. the mobile has problem with its mike and we are not able to hear the calls. aqnd battery down with in half and hour
the details of purchase- amount COD Rs.2999.0. datd 10-2016
handset vox kick k8Dual sim video calling smart

invoice no. Fd697DEL16-3951
i wish to return this phone and get a new karbonn A81 mobile
please accept my request. and take an immediate action
contact no.[protected]