Xiaomi India — xiaomi mi max

Address:

Mumbai City, Maharashtra, 400706

I had given an mi max phone in the service center 2 weeks ago because the lower part of the screen wasn't working, so the guy there told that it will be done next day but it has been two weeks and the phone is not fixed yet. I called them so many times and they only told that it will be ready i 1 or 2 days and now they are telling that it will be done in this week. I didn't expect such a poor service from xiaomi.
I request you to please take some action