Vivo Mobile India — Green line in display after software update

The issue is now getting out of Hands the same issue the other users have found, my phone is about 1.8 years old I got this issue a 6-7months ago after updating the software the green line is taking all over my display...i contacted the vivo service centre because of scratch in the edge of panel they refused to do it...whose.mistake is it when the display is broken without a physical damage.fix this issue of my phone..there is no Dave's in the screen however they refused to do and asked to pay full amount of the display replacement...this is the problem of the manufacturer..