HCL Technologies — repairing of display

Address: 110018

I got my display repaired from hcl technologies limited (Vikaspuri extn) and found that some areas of the screen are'nt working. So got it fixed again and this time also the same problem persists. The addition to this problem is that the proximity sensor has stopped working due to some fault during the repair. Please look into the matter. Luckily its under warranty so i can claim it but who wants to stay there for the whole day even after paying for the bill. I am really pissed of with their services.