Xiaomi India — Mi4 mobile phone

Address:	Indore, Madhya Pradesh, 452011
Website:	mi.com

I purchased xiaomi mi 4 mobile from flipkart.com for offer price rs.13000 (mrp 15000) in january. i got an issue in april, then i went to the nearer service centre in indore near industry house, a. b. road.
They submit the phone and told me to wait for max. 20 days as it was some hardware issue. after one month they returned the un-repaired phone to me and said that the company has stopped providing harware to them and started a new pickmi service for a price of 190rs in which thy get come to pickup the phone from home. i avail the service, paid the money and the official wait time they gave me is 7-10 working days, in which they resolve the issue and get me back my phone. from the 10th day to the present day, the phone did't repaired and also not being replaced. whenever i call to the company's tollfree no. for information about my phone, they always gave me same answer that your device is under production and it is being repaired. and when i object for the time they have taken they always give me same response, that they have escalate my issue and their backup team will contact me to resolve the issue. sir, i am just frusted that i have purchased from a company, who don't care about there customers. i am student and this matter angry me when all my friends ask me about my phone now.. also i called them approx.80-90 times now, also 15-18 emails, also tried facebook, twitter, googleplus's page but they did't resolve the issue. sir please solve my issue - 1. replacement.
2. cashback if replaced phone is of low mrp than mi4's price rs.15000.
3. extended warranty from april to replacement date when they resolve the issue and i get phone back.