I agree with Zaraha, try to get Chanels opinion on it.
To me that looks like patent leather, usually there is nothing that can be done to remove stains on patent leather. Especially if the stain penetrated the surface layer lacquer. Sometimes with surface stains it can be removed (super carefully) with (VERY SMALL AMOUNT)nonacetone nail polish remover with a q-tip. But that's only if your daring, keep in mind the surface/gloss layer is VERY thin so you don't want to rub that off, again it might not come off at all if the stain already penetrated pass the plastic layer into the leather.
I think its best to see what professionals think.
I'm sorry this happened to you.