Hi guys, I visited service center before few hours today for the same issue and my experience with them was terrible. They said my warranty is void as body around screen is having (very small) dents (due to wear and tear). Does outer shell with small scars voids your warranty? So far I have been using phone with launchers other than stock one ( I prefer newly ported pixel 2 launcher, though I was using ported moto G5 launcher before) with adaptive brightness on and severity of this issue was negligible (though you'll feel issue while charging). As they have declined my warranty I am going to unlock boot loader. Fun Time.
---------- Post added at 01:14 PM ---------- Previous post was at 01:01 PM ----------
Hi there, I faced same experience as your brother had faced. Their behavior clearly states these people don't want to correct there mistakes. As it is problem with panel we can't do much about it. Though try this, if it helps you a little. I am using rootless pixel 2 launcher by paphonb, works like charm (Changing default launcher helped me to some extent and I don't get frequent ghost touches even while charging).
https://forum.xda-developers.com/android/apps-games/app-rootless-pixel-2-launcher-google-t3688393
adaptive brightness on, set brightness level to half. I am facing this issue only while phone is charging otherwise it runs smooth.