XPS 7590 OLED screen banding issues

My display has banding issues. I have been in touch with your support department. First they sent out an engineer to replace the display in the laptop. The replaced screen was also faulty. The engineer saw the problem himself after installing the replacement screen.

When replacing screen didnt solve the issue then a replacement laptop was sent. The OLED on the replaced laptop is the worst. 

I want to know, are you not quality checking these machines? Are there no working screens with dell that can resolve my issue. The only option being given to me is to get a refund.

This goes to show that Dell is incapable to resolve a bad display issue.

Anyone else having oled screen should try the below link https://youtu.be/dP4vEGREGD4?t=90