Line in the touch screen LG stylus 2 K520D

https://ibb.co/mOcJ6o

I bought a lg stylus 2 from dubai 700 AED

it was working very fine but after week a line in the screen started to appear and things started to open automatically on their own. some time line in the screens disappears and everthing works fine and after 2 or 3 mins it appears again and messes things up have uploaded pictures in the link have a look please..thanks

is there any solution to this problem, Many thanks