Galaxy Z Flip3 5G  #Sumsung

Hi all, does anyone facing this issue? Vertical green line display on Samsung phone screen. It suddenly occurs on my phone with no physical damage.

I've read some posts, and it also happens to Sumung's other series phone. They claim the service center does not cover any warranty and needs to pay for the screen replacement. Some even get their repaired phone back, the green line is back for a month later. Does this can actually can be fixed? 

I've been sick of negotiating with Samsung customer service staff as this happened before. It started with a suddenly appearing tiny green dot, at that time still under the warranty period, the staff checked my phone and tell there was some scratch on the back, so the screen issue will not be covered by warranty. Also, the manufacturer-given screen protector only lasts for 8 months, it then starts to have a bubble/peel-off in the middle. After paying to change the screen protector and 1 month later same issue back. I can ignore these issues but currently, the horizontal green line is really annoying and affected my usage.  Can someone advise on the solution, please?