We are sorry to hear about your experience with your Samsung Galaxy S23 Ultra having issues with a small scratch on the left frame. If it happens on my device that I took care so much, I will be frustrated too.
Should you decide to get it fixed, you may visit the nearest Samsung Authorized Service Center in your area. Rest assured that your device will undergo an assessment, and our Samsung engineer and technician will guide you and offer solutions to restore it.
Just a disclaimer, any customer induced damages, or no defects found, charges will apply.
Should you need further assistance and guidance, you may contact us via our online Samsung Customer Care support channels below.
Even with the coarsest sandpaper, I don't think it's possible to polish or repair the frame without ruining the frame even more.
S23U user here as well and is using super thin carbon fiber case. So far, I didn't remove the plastic cover on the aluminum frame.
But hey! Phones are materials. They get scratches and such. Even my 2.1M vehicle got scratches as well.
Holy **bleep** brother 2.1m vehicle. I wish I had a vehicle worth more then maybe 12k. Lmao. I have a 08 335xi modded and tuned in many ways. Still needs work tho. It's never ending. Never met anyone with a vehicle worth so much. Hope all is well man