Displaying products you can't sell

I wanted to buy a painting at Decofurn in Montague Gardens. There were several paintings on the walls, but when I wanted to buy some, the staff said they had ZERO stock and couldn't give me a date for when the stock will arrive. They also then refused to sell me one on the wall. I spoke to Maureen and manager Allen, but just said that they can't help. I asked for the MD, they gave me his email address, but their server blocked my mail. Why on earth do you display things, which you are unable to sell or even provide a date for when it will be available? I drove all the way to your warehouse, the painting I wanted was on the wall, still wrapped in plastic, but I had to leave without it!!