On my display in addition to the white line the bottom has become opaque.
Capturing the image by the screenshoot not you see I had to take a picture with a second phone.
Your screen is damaged. If you received your phone in this state, I suggest you to contact your reseller to resolve your problem. Only replacing the screen can help.
bencebacsi unfortunately I can not make a picture of the defect because this crack is visible only when the screen is off, and when I try to take a photo in it all reflected the defect is not visible