ASOS customer care

I’m in need of help. I’ve received a faulty item (dress) from asos, one fault is in the seam of the dress. The other is flat out how it looks compared to imaging. I tried speaking to someone on their chat service and found it unbelievably unhelpful. They want me to pay for a return so they can assess whether or not I’m eligible for a refund? The dess will end up costing me more than if I just keep it, faults and all. I tried getting that message across but at no help. I tried suggesting giving me some kid of discount and then me just keeping the dress. But that wasn’t an option either. I have good images to show the fault as well as comparable images to what they have on their website be what I’ve received in terms of dissatisfaction with the item itself. Does anyone have any kind of advice?