Cushionaire "SELFIE" Flats size 7

Brand new and never worn. Size 7M I sold these, and the buyer said there is a stain on the top toe area on the right shoe. I put cleaner on and scrubbed the area, but I couldn't then and still don't see a stain. If I'm wrong then tell me please, but for now I am selling them bc they're nice and someone should enjoy them, they just didn't fit.