In case your Koi shoes don't fit in size or style, there's nothing to worry about! All unused items bought in the last 28 days are returnable if you kept their labels attached.
Unfortunately, Koi is not offering exchanges, so what's best is requesting a refund, and then place a new order. However, think twice before you do so and make sure this time your order will be in the right size or colour. Multiple deliveries are growing your carbon footprint.
Please note that due to hygiene reasons, earrings cannot be returned.