Die walls are rarely scratched, they are just too hard. Your die has bits of brass clinging to it. It's called "galling" and means you failed to provide enough case lube so dry brass pushed over dry steel and resulted in the clinging bits adhereing to the die. That's what has scratched your cases and, once started, it will only get worse and the case scoring will get deeper, weaking the brass unless you correct the problem. You can lap out the offending bits of brass at home.
Take a 6" length of 5/16" dowel rod and saw a narrow 1" long slot in one end with a hacksaw. Insert a 2-3" length of 400 or 600 grit silicon carbide paper in the slot, use enough to make it a really snug fitting lap in your die's neck. Chuck the other end in an electric drill. Put a spritz of light oil on the paper and rapidly spin your improvised lap in the die for a couple of minutes to polish out the brass bits. Try to keep the dowel fairly well centered in the die.
Clean the die from all abrasive, then lube and size a case. The scratches should be much improved, maybe even gone. Or you may have to repeat the effort a couple of times. You can bring the die to a mirror polish with finer grits of paper. To look deep inside the die, remove the decap assembly and stuff a bit of white tissue into the neck, it will reflect sufficent light back to let you see things you couldn't otherwise detect, including the degree of internal polishing you achieve.
Don't be concerned about damaging the die, you won't. And it's already damaged isn't it? Actually, the die wall is case hardened so hard the light lapping you will be doing will remove little or no steel, it just polishes away the galled brass.
I get fine grits of silicon carbide paper (a black "sandpaper") in Walmarts auto paint section. The spay carb cleaner is there too, it's a buck and change for a can and well worth it for die cleaning on any loading bench.
For case lube, I like Imperial Die Wax but Kiwi "Mink Oil" (sold for boots) is about the same product. So is "Sno-Proff" boot treatment. All three are soft waxes. They work very good as case lube to prevent sticking or galling and are easy to clean off afterwards.
I spray WD-40 in my dies to reduce rusting before putting them away. They get a spray a of cheap carborator cleaner in them before use, then a bit of toilet tissue wrapped around a pencil wipes the interior clean and it's ready to go, all in a few seconds.
Lube your cases better next time, and keep the die clean too.