Lenovo — Service not done yet

Address:	Kamrup Metropolitan, Assam, 781009
Website:	Lenovo.com

MY smartphone's display got cracked. I went to the service center and ordered for a new display. They said the product will take a week to 10 days time & will cost 3700. They even said that if we order for the parts, you have to come the same day and fix it or else the part will get return. Else pay advance amount for the pay to receive it soon. I even paid an advance of 2000 for the screen and have been waiting from 01/10/16 till date, which is 37 days till date, still there is no information as to when the screen will come and my phone will get serviced. I went 2-3 times to the service center but they don't have any answer.
What is the use of paying advance payment also & still keep waiting for 40 days?
Serial no - [protected]
model- A7020 black
the order copy of the same has been attached.