Red line on display in apple watch se(2nd gen)

I have this red line just below the top bezel of the display in my apple watch se (2nd gen). This line is only visible when I flash a light on display or in bright sunlight. Is anyone having the same issue? Apple India refused to replace it stating that that hardware diagnostic is fine. Had a converstion with apple support and they are giving me silly reason that there is some material or sensor used which is red in color and they cannor do anything about it. What should I do in this case?