Vertical line problem on retina screen
I have been using MacBook Pro A1502, late 2013, 13" retina display over a year and i don't have the international warranty anymore. Now, i took it out to work the other day and when i came back home i saw a vertical line. I pressed the bottom area of the screen left-to-right hard where basically the cables or connectors should be, and the line disappeared. It's not exactly on the screen, it's on the black plastic below the screen that connects MacBook body and the display (see the image i have marked the area).
It was months ago, but now the line is back again. And, this time there are two lines. So, i pressed that bottom area again since it worked last time, but nothing happened this time, and 3/4 lines appeared instead. I pressed few more times, 2 lines are gone but there are two overlapping lines not going anywhere. I have attached images of the problem, also i marked the area where i do the pressing.
What do i do now, please help me out.