Exchange complains

We bought the Lounge Louis Vuitton U Shape we paid for everything cash from MACO they informed us that they can only deliver on Friday which wasn't to much of a problem. When we made the purchase no terms and conditions were explained to us Upon delivery the delivery guys arrived in the afternoon, removed the packaging off the couches then started assembling the stand we bought together with the couches Once they were done then they moved to placing the couches into our lounge that's when we discovered that the couches were too big to fit into our lounge We tried contacting Sam the sales person to try and explain our issue and explained to him that we would like to exchange the current couches for couches that fit Sam informed us that he is trying to contact management and see if we can't work something out because their issue was the couches were already unwrapped Unfortunately management refused to exchange them due to the fact that they were unwrapped even though we contacted them that very moment the couches were unwrapped and delivered It is unreasonable that they couldn't help us in exchanging even after paying cash for everything and contacted them that same time the delivery happened but they refused to help us