Returned products damaged by their staff and i get blamed

I returned 2 items. A cast Iron pan and a SD card. The pan came wrapped in bubble wrap only. The SD card was in a sealed package. I did not open the SD packaging, I did not use either of the products, i returned them both in the same condition I received them. My return was declined due to that the SD card was opened and that the pan was not in its packaging (which there was none) and there was a water mark on the inside. I asked them to show me a pic of the bottom of the pan, because that will show if it was used or not. Other than that it seems like someone spilled something in the pan. I will not be held responsible for how their staff handles products after they took them back from me. I challenged them to check camera footage to see if the SD card was open or not and the condition of the pan. But surely they also shouldn't have taken them back if they were that "clearly" in bad condition. I wonder how many people get *****ed like this - thye take your products back and then they damage them and claim it was you the customer.