white cloudy round shape big dot on screen

I too have same problem, mine is 42" Web OS 3D smart TV of 2015 model.

We have noticed a white cloudy round shape big dot on screen 10days ago, now it became 3 big dots on the same line in vertical alignment. When I called LG Customer Care, they are only talking about their technician visit charges irrespective of we get it repaired or not. this is very disappointing whilst most of our home electronics like Fridge, TV, AC etc..of LG brand.

Hope you will quickly acknowledge my problem...positively.