Poor quality goods

Last year December I bought Pearl 4 piece lounge suite cash from Lewis Newcastle store . During the course of the year my mother discovered that the was a fault with the couch and she went to the store to report and they fetched that couch for repairs, while waiting for that, there was a problem with the other one's.My mother went to the store to report again and i called the customer service line ref 584597 and they only got back to me after 5 days with no good news and I don't think they have communicated with the store because their stories doesn't add up. Finally when they decided to bring back the couch they took for repairs and it was discovered that there's a fault with the same couch, since I'm not happy with the quality of their goods I requested my money back or new couches and I was told that is not possible. Which means that I must keep on going back to their lousy store to report the same thing and the warranty is almost finished , that is very time consuming and frustrating hence I'm using my resources to contact them. When they want sales they keep on calling but once you buy their goods they don't care. I paid a lot of money for those couches so I need to enjoy the value for my money not this mediocre.