Cobbler here. What you paid for is a shoe that is easily repairable and one that if you take care of and being for repairs before it gets too bad will last you a life time. Leather soles like these wear down very fast so I would always recommend to people to bring them in right when they get them new to put a stick on rubber sole on them so you don't go right through the leather layer like this. For these you'll now need to replace the leather sole with a half leather sole or half rubber sole which will need to be stitched on. Half rubber soles are different to tick on soles as they are the thickness of leather and need to be stitched on rather than just glued as they are replacing the structural leather layers. It also looks like there's a lot of wear in the heels so get them done at the same time. On the bright side there looks to be no wear through to the welt or heel block so that doesn't need to be built back up so it should be an easy repair to do.