When you say you haven't received your order, if you check the order status does it still show as "Pending Dispatch"?
Many users are reporting delays to delivery, especially if you've ordered a so called Customised Colour (marketing speak because it isn't Customised at all, it is just another colour choice only available from Samsung) or the 1TB version. Even worse if you've ordered a 1TB Customised Colour 🤪.