Xiaomi India — Service of mi4i handset

Address:

Moradabad, Uttar Pradesh, 244001

My mi4i phone have a charging problem. I am submit my mi4i phone to service centre from 20 june 2016 and service centre employee told me that your charging jack is not working and it will be come from the company between 7-10 day days but my phone was not giving till last 20 days when i asked to service centre that that when you will giving back my phone they told me that we can't give you any particular date when part come from the company then we will give you your phone.
Please do some something because i have to face so many problem without my phone and put so many losse.