Hello Andrew, we sincerely apologise for the inconvenience you experienced. When an item is returned and checked, it is then refunded on the system, which unfortunately doesn't automatically refund the original postage paid. As this is a rare and unusual situation, we have to manually refund the postage if required. I can see that a colleague manually refunded the postage amount yesterday, 1st July.
We are also looking into how the incorrect product was sent to ensure this doesn't happen again. We're really sorry for the inconvenience and appreciate your understanding. If you have any further questions or concerns, please feel free to contact us directly.
Best regards, Lauren, Diabetes UK online shop team.