Hello there, I would recommend reaching out to our Galaxy Fold Premier Service team. They can be reached via 1-888-970-3653.
How in God's name did you rub a coating off the screen, i have my fold since November and I probably expose mine to the most extreme conditions of anybody on earth. I own a metal fabrication business and get grinding grit and dust and dirty on mine all day long cleaning the screen dry with a microfiber rag and mine is like day 1 new, how do you know you rubbed through it? If you see areas that look rubbed through when you clean the screen with a liquid cleaner that is not rubbed through, just a smoothed out pattern in the plastic from where you rub the most.