Nokia 5310 xpress musiq
Display problem

I had brought the handset in marach fromn the day i had brought i have problem of restarting now after changing software their is no problem but now there is a dot in my display and it is growing day by day (means the dot become a line) will the company replace the display of the set as it is under warranty... pls replay me fast and i also want nokia customer care address in banglore, karnataka state india