Samsung — Samsung TV line on the screen

I purchased a samsung TV 55Inch on Flipkart. After receiving the tv i noticed a line on the screen and raised a complaint to Flipkart and Flipkart forward it to samsung. A person visited the the and inspected the tv and confirmed that there was a line and can be replaced. Next day got call from samsung saying that we don't find any issues with the tv and closed the ticket. Again I raised the ticket and and samsung people say it's a content issues. If it was a content issue i would be getting the line in a perticular channel but the Samsung person argue it's content issue and cannot be replaced. I request to please do the needful. For the reference the photos are attached below