repair or replace the screen panel

Location/place: RZ-20,H BLOCK WEST SAGAR PUR NEW DELHI-110046

Name of company/service: HP

i have a hp note book (hp 630) which is under warrenty period . there are many white spot developed on the panel of screen . i have gone throught hp service centre but they refuse to repair or replace. main problem is that the white spot is incresing day to day.