Damaged goods unfixable

I brought a lounge set from bradlows last year and it was delivered. A few months later the 3 seater broke and appears that it may have been a fault from the factory. I reported the issue and it was collected for repairs. the couch was brought back but still had the same issue and to date it has been sent back 4 times and still is not fixable. I pay for this damn thing on a monthly basis and i was not assisted atbthe store (bradlows Jabulani mall) they were rude and told me to contact the suppliers myself. Head office has also done nothing and i still am not assisted. What i fail to understand is why must i contact the suppliers as i have not contracted with the suppliers. Further it is clear that after 4 times this couch is not replaceable so is it not within my CPA right to have this thing replaced or should i not be refunded? I think this matter should be taken further . Its almost a year now of being inconvenienced and Bradlows just does not care . I am appauled by their service andbi want this agreement cancelled.