Mivi — Not repairing and returning product in warrenty

Address:	Plot No, 29, Rd Number 76, Jubilee Hills, Hyderabad, Telangana 500033
Website:	www.mivi.in

I have bought one earphone of Mivi company from flipkart.
In warrenty period it's mic stopped working so I have raised repair request.
They picked up product from my home and and after many mails they delivered so called repaired product. but when I tested it it's mic and speaker both were not working after repair.
So I again requested for the product repairment.
Again they picked up and received the product on 29th of novemeber.
Its been 10 days and they have not returned my product not even replying on my mail for product issue/ repair status update.