Sony India — sony fhd tv dust in a panel issue

Hello sir,

I am having issue in sony tv panel. There is a dust in a panel, i have reported complaint to sony 4 months back and still its not resolved.
One month back they came with new panel but in that panel as well dust was present.

I am not at all happy with customer service.
Tv is in warranty, help me what should i do. I am planning to go consumer court.