Hp — Display issue Under warranty time (Case #[protected])

My HP Laptop (HP Spectra X360, with 2 year extended warranty) having display issue since last month. The issue is two mild shadow in below right side of laptop. There is no physical damage & pixel, No white & black dot. I complained to HP chat service regarding this issue. They asked photo of my laptop display and I sent also. They informed that it is physical damage. I explain to them it is not physical damage. I asked them give explanation how it is physical damage but they did not give any explanation. I informed that I can proof it is not physical damage and told them to see my laptop physically. But next mail they informed me that it is not under standard warranty and closed case. I am still warranty period. I need explanation how it is physical damage and why it is not under standard warranty. I paid 18k for extended warranty on 23-Oct-2019 and still I am in warranty period. Please give me solution.