Money back

Bought a new couch from Rochester Centurion lifestyle, after a month it started sinking in. I went to report it at the shop and found a white lady who told me that they don't take complaints at the shop and I must do it online and she logged into the computer and showed me the website. I did report online and a month later there was no response, did another one and still no response, after two month the arm rest of the couch broke when I sit. I then wrote another one and said if I don't get response I will take it up with social media and I then received a reference number and few days later received a call that they will come fetch the couch. On arrival they confirmed that the couch was sinking and the armrest broken. I then told them that I need a replacement and I am willing to top up if there is a difference in price but I don't want that one anymore because it is a few months old and already have issues, clearly it has a factory fault. They adviced me to go to the shop for my request. A lady by the name of Marie assisted me and was shocked that I was sent away when I went to report it the first time. She confirmed that the lady who sent me away used to work at the shop and after explaining my frustrations she promised to take it up with the Area/Factory Manager. She communicated with me and was giving me updates but the Area/Factory Manager refused and said they have fixed the couch and I must keep it. I was willing to top up for another couch but now I just want my money because I cannot have a couch that broke within two months and I reported it immediately and their employee sent me away , what is going to happen in a year?I don't even want any of their product I just want my money back.