Selling Second hand item as New

I bought a Sunbeam convection oven from game. The handle that is also the on off switch did not work properly and I asked my daughter to return it today. Game City was very helpful and said to her to get another one from the shelf as they will replace it. She then went and got one but it was the only one on the shelf and took the last one. When I got home I asked her whether se had it tested and she said no and it was the last one and she knew I wanted it. When I opened the box to my surprise it was a previously returned one that was used and placed back on the shelf. It was obviously returned as well due to a fault, repaired and now been sold as new again. The bottom of the lid is full of brown fat marks and you can clearly see that this item was used. I am to say the least very upset as I paid for a new item and if I wanted a second hand one I could have gone to a second hand dealer. They also charged me for a new item. This is not what I would expect from Game. I now have to drive all the way back to another branch to return it yet again as this is not acceptable to me. I will definitely warn all my friends and family about Game City.