LG g2 mini- screen keeps dying and fading colours

I bought this phone, after 6 days the screen cracked when I unlocked it. So LG replaced the screen, now... there are lines across my screen,, I can hardly see anything,. Sometimes the screen works.sometimes it doesn't... my keyboard hardly ever works... then the colours start fading., like black goes green and white or light colours are purple.<br> <br> I cannot see myself purchasing another LG PRODUCT if this is how they work