Xiaomi India — Headphone replacement

Address:

Kolkata, West Bengal, 700091

I have given my mi earphone in mi service center (Infotel services shop no - 1, ground floor, infinity benchmark building sector v, salt lake city, kolkate) on 11/8/2016 but till now i have no information for my earphone. I have gone several time to the service center asking about the status of my replacement but can found any reply from the customer care executive. I have also tried to call many time to service center but every time the call got disconnected.