Quality couches damaged within 6 mnths of purchase

I bought couches from Morkels with leather touch backrest. Within 6 months of purchase, I started to realise that the couches were defective. I called my salesperson and explained the situation, and she promised to take it up with her manager. Few weeks passed by and I contacted her again, this time alerting her that the couches are going to tear, since I could see how soft the backrest was becoming. After few weeks I called them again, the couches started to tear, that's when I asked them to come and take them back and replace them. I was told that they could only repair them, so I waited. After months of asking them to take the couches, they finally collected them on the 24.04.2015 and they took them to their warehouse. I was told the supplier will fix and return them. I kept on phoning them until yesterday 15.07.2015 when I was told that the supplier refused to pay for them saying that I must be the one to pay for the repairs. How do I pay so much money for the couches and they only last me for 6 months? I believe either the supplier or the shop gave me defective couches. I feel ****** of my money since I'm also paying insurance on the couches. I'm very disappointed in them.<br>