Xiaomi India — Mi 4i servicing issue

Address:

Chennai, Tamil Nadu, 600122

As USB port in y phone (Mi4i) is burnt I gave my phone for servicing at MI store anna nagar, chennai. I gave my phone on 9th may, But I haven't recived my phone yet. I tried to call them. But they aren't attending the call. I mailed them. But their reply is not satisfactory. They said the part isn't available yet. So, How long will these guys take to just replace USB port ??