Iphone 12 black paint peeling off

I’ve been using this iphone 12 for 8 months and the paint started to peeling off since 2 months ago. I’ve never drop this phone or scratch it. It’s also protected with a case but then the paint started to peeling off near the power button with just a little but it keep peeling off and now the paint near volume down button also started to peel off. Does anyone know the solution for this issue? I’ve asked the authorized apple reseller in my country but they said that it is a cosmetic issue and can’t be guaranteed.