Lenovo Reverses Screen Replacement Decision After Learning Laptop Was Bought as a Display Unit

I purchased a Lenovo Legion 7 Pro 16IRX8H laptop as a display unit from a seller on Idefix. When the device arrived, I noticed that some keys on the keyboard weren't registering. Thinking it might be a temporary issue caused by dust or dirt, I tried to clean the keys. During the cleaning process, the mechanisms under some of the keys broke, and I ended up using the device with an external monitor and keyboard.About one to two weeks into using it, I noticed a permanent burn-in on the screen. Since I believed IPS panels shouldn't be subject to burn-in, I did some research, came across content suggesting it might be temporary and could be fixed with certain videos, and tried those methods for days — but saw no improvement at all. The device still had six months of Premium on-site warranty coverage remaining, so I contacted Lenovo service and requested only that the screen be replaced free of charge under warranty. Since I considered the keyboard damage to be my own fault during cleaning, I didn't raise that as a separate request.During my conversations with Lenovo, I was asked for numerous photos and details about the screen burn-in, all of which I provided in full. I was told the screen defect had been acknowledged, that work would be done on the device, and that they would get back to me within a few hours. Toward the end of the phone call, I mentioned that I had purchased the device as a display unit, that I had no prior knowledge of this screen defect, and that the seller had not disclosed it to me. Following that disclosure, despite having already acknowledged the defect, Lenovo reversed their decision to replace the screen — saying the seller should have informed me about it.There is a defect here that involves no user error and should not exist on an IPS panel. Whether that defect was noticed by me, by the previous user, or by whoever might have bought the device after me, I believe it should be covered under warranty regardless. I was particularly disappointed that so much difficulty was raised over a screen replacement — a relatively straightforward repair on a laptop — especially when I've had far more costly work done, such as motherboard replacements, handled quickly and without issue on other brands. The fact that Lenovo refused to replace the screen on a high-end device with Premium on-site warranty coverage has seriously damaged my trust in the brand.I'm requesting that the screen burn-in on my Lenovo Legion 7 Pro 16IRX8H be covered under warranty, that the screen be replaced free of charge, and that the negative experience I've had throughout this process be taken into account.