Stuck with damaged dress I paid for

I ordered a dress online from Zando which was delivered a few days later. I received the parcel without opening it immediately. A day later, I opened the package and slip it in for work. Upon arriving at work, my colleague pointed out that the dress had a small hole at the top front section. I called Zando and they arranged a return. Weeks after the return was collected, I am now told that the item returned isn't sellable and they are delivering it back to me!!!