Oh my God i cannot belive that!!!!!!!!!
caz, leather stretches with wear, firstly double check the product label to be certain the outer is leather, the inner is probably synthteic and fabric. All you need to do is wear them with sports socks around the house for a few hours a day, you can buy a leather stretching product from a cobblers but probably within a few wears they will be fine. do not wet them or have them in contact with any kind of water, you can use a leather cleaner on them that also contains an element of leather moisturiser.
To maintain them keep them dry and treat them with the leather cleaner or leather soap regularly. if they have a narrow heel and smal heel tips make sure you have them re-heeled before the wear eats into the actual heel.