Refund issues when courier returns/logs incorrect packages

On 16 May 2023 I ordered a laptop bag, after removing it from the packaging I found it was to small. I returned the item to the original box it came it (not even removing the original stickers) closing it up with new tape and logging my return on the website an the return was collected from me (MRRN-K6JKJ-7W98). The courier company collected it. I received a mail stating that the items in the box were not the same items as I ordered and would be returned to me. I explained that the photo sent to me with different items was not what I ordered and returned and that they need to investigate the matter with the courier company. They have made not attempt to do so. I requested the photo and logging of the package collected from me and still have not received it. Today they request a delivery address to deliver items to me that I did not order. How does this make sense. It was the original packaging.