I had the same issue with S22 ultra.. white line at top of the phone. I had to put in power saving mode or reduce screen refresh rate to get it of it temporarily
We acknowledge your query. We request you kindly visit the service center for a physical inspection of your device. So that they can check the exact issue with the device and fix it as the earliest. You can locate your nearest service center with this given link: https://www.samsung.com/in/support/service-center/
