Xiaomi India — Mi4i bad service

Address:	Burdwan, West Bengal, 713301
Website:	www.mi.com

Sir i have purchased the phone on november 2015 but from next month the touch screen doesnot work properly and the phone hanged every time.but from april2016 the condition become worston 22nd of may, i went to dhanbad customer care they said it has touch screen and mother board issue and they create a jobsheet (js[protected])against it but one month have passed and they ddnot solve the issue though my phone is in warrenty period.every time i called they ssaid the parts are not available..
so plz help me i am in big trouble..plz try to replace my phone or change the parts as early as possible...
yours sincearly
koushik roy