I returned his faulty phone to him as I had checking warranty, And he didn't pay for any shipping cost. Issues in the phone:
I am sending the phone back to your address because of the following reasons:
Phone is chinese version while you told me there is google play store that meant it is global version.
Phone ear piece speaker is faulty and dusty(I mean really dusty). At full volume voice is lower than usual.
Phone is mi cloud locked. I have tried to remove that account with the passwords you provided me but it did not unlock. So it was useless to me as I can't do factory reset or anything else.