Dell — Not repairing the laptop since last 3 months

My dell laptop got damaged due to accident. I submitted it on 24.02.2022 in your service centre Bhubaneswar. The manger told me he will repair it in 15days. But even after passage of 3 months it has not been repaired and now the manager is not reposting to the phone. Also when I visit the service centre he is not reposting properly and not telling me when he will repair the laptop. My office work is hampering badly. I think I have made a blunder by purchasing a Dell product. I will never made this mistake ever in my life.