Isabel marant sneakers 36 brand new

I'm selling my brand new Isabel marant sneakers that I bought from saks fifth ave for $700. I bought a size 36 which is my normal size but these are cut small. I need a full size bigger and they don't have my size anymore. I wore these twice and not for long because it hurts my feet. They have a slight scuff mark at back of the shoe and the bottom of the shoe is really clean. I have the dust bags available as well.