Incorrect items twice

I ordered a mini fan aircon twice and both times they have send me the incorrect item, it shows that there is stock available but when I open the box it's the wrong item but the correct leaflet inside. How is that possible and there is no communication advising me that there is no stock and asking permission to send a different product. Then if I request a refund the don't want to refund the delivery fee that I paid, it's not my fault the item was delivered incorrect and they don't have stock, I will never order from Takalot again