Visit service centre. It's free of cost. I got same vertical line issue in my S20 and reached service center. They will check for any physical damage and dents.. If there is not physical damage and dents they replace display and I got it..
I am getting green vertical lines after an upgrade of security patch and one ui. I have got a single line at first and now one more line started showing up. many forums its saying its the software upgrade causing the damage to display.. I got a small edge spot on my display which is a physycal damage but was not giving any usability issues in my phone. But right now due to the upgrade the green lines are distracting vision and the display is not that easy on eyes for daily use. Why Samsung is not taking responsibility for such damages caused by their software upgrades to users?. I guess they will deny the display replacement as I have a physycal spot damage on screen pixels.my phone is s20 plus and many similar complaints in forums can be seen for this same model caused from software upgrade.
