Sansui Televisions — Service follow-up

We have bought a 42" Sansui /projection TV in 2006. Last 2 months we have been facing problem in the display screen. The picture fades off completely and the screen becomes blank all the time. We have been calling the customer service for the past two months and they never responded. They keep saying that they would come but never did that. It's so pathetic that we bought the product from Sansui.