HP India — Laptop repair

I had given my laptop for service with HP world Rajajinagar Kuempu road Bangalore on 9 October 2021 where they found out issue with the harddisk and asked me to get it replaced. I asked them to check it properly. I delayed the the pick up but received after 2days late paid the amount everything. On the same day I noticed some flickering on the screen, turned it off and inform the service center. Next day again same happened I spoke to person (name hidden) at service center and forced her to check it once and I took it to the center. She couldn't diagnosed the issue and said that it is working fine and there is no issue. I showed her the pictures and video of the flickering. Again after coming back I faced the same issue took it to the shop where she informed she is not able to diagnose and asked me to leave the laptop this time, I wasn't able to complete my work and mentally feeling very burdened because of all the happenings. She formatted the new harddisk all my data's were removed. When I texted her to not to remove data she said it is already removed etc it was really affecting since I lost important data. Now, she kept on telling me that there is issue in mother board etc etc on the other hand she was also saying that the engineer is not able to detect the problem etc. I begged her to keep my data but at the end I felt as if that she wasn't even caring about all that. At the end after so much of discussion and affecting myself I couldn't get any help only the refund of the amount.