Damaged mattress

On the 6th April 2014 i bought 2 Desire beds at the Mattress People in Fourways. Almost a year later i reported that one of them is making a funny sound. The manager Lester exchanged the base and i phoned him to say that its not the base. He contacted their supplier and a guy called Ridge came to my house on the 9th June 2015 to check. He confirmed that there is a damaged spring but he could not exchange as it was out of the guarantee period. I told him that i reported this to the shop before the 6th April. I then called the shop manager again who then said there was nothing he could do as that brand has been discontinued. I am now stuck with an uncomfortable bed. He asked me to check the warranty on the mattress and there is nothing on both. I asked him that do they really sell unwaranteed beds in their shop and he said no but he is unable to assist. I dont think i will ever but anything from this shop and its a reap off. I paid over R3000 for each.