Xiaomi India — preet vihar service center

Address:

New Delhi, Delhi, 110092

Service of preet vihar service center is very bad, specially its employees, they are too slow. I was 3rd in the row but waited for half an hours. They also overcharge
For the services, as they asked for 1350 for a mobile battery and later after some discussion they agreed for 1200 only. How is it possible if the rate is same at all centers.
Kindly acknowledge me about the action taken.