Xiaomi — Fraud by service center and misbehaviour by staff

Address:	Kolkata, West Bengal, 700060
Website:	www.mi.com/in/service/repair

I broke my phone (xiaomi mi 4i, imei no: [protected]) and submitted the same for change of lcd/touch on 05. july.2016 to the mi exclusive service center (address: arya regency building, no 1, andul raj road, near hazra crossing behind jatindas park metro station, kolkata, west bengal 700026; phone:[protected]). the same was repaired and returned to me on 08. july.2016.
However, the staff failed to charge my phone and upon opening the same, informed me of water in the phone motherboard. before submitting the phone, it was successfully being charged and did not have any other problem except the problem with the touch.
The staff decided to change my motherboard (under warranty) and said it would be made available to me in 10-15 days. jobsheet no: ish05373.
Thereafter, upon regular inquiry, i was just informed that they would need 10-15 more days because the part was not available. this is the only thing they keep saying for each day till today.
I have been reiterating the fact that i am a sailor and would leave for my job by the next week. however, there has been no enthusiasm from the company and they show no signs of returning the phone to me anytime soon.
It is the 14th day since my phone has been submitted a second time; but the staff has only added to their mis-behaviour and now stated that the phone will not be available in the next 20-25 days.
Kindly understand that it is almost a month since i have submitted my phone and i genuinely need it before the net week; to attend to my job.