Xiaomi India — regarding extra charge on service

Address:

Patna, Bihar, 800001

I had submit my hand set for display change only at asc jamal road but they had change some other parts also whiout any information and when i asked for bill then they replied we had not told to provide bill after argument of minutes they provide me bill and i saw there was two more parts which was also replace and total amount was less than they charge vocally when i asked why did you change these two they replied it was also defective so i replace it without inform you where as hand set was under warranty that this service centre is not just service centre its place to loot the customer on any how not only dozen of customer has shout here in front of me by 12.10.2017