Dishonest conduct

I bought a queen size bed Cloud nine and was brought a sleep master and had to return it and was brought again incorrect bed .King size restonic but I took it and paid a difference ,however just to discover that withn 3 weeks there is a huge tear in th bed meaning that the restonix that was brought could be **** .I addressed this and I am being left in read and hardly any response.i sent several messages explaining I am scared there might me more tearing as the stitching is coming lose for a brand that is high quality ,meaning restonic..I have been asking for a replacement as the bed has a 2 year warranty, however it is now two weeks and no exchange but more excuses. I paid cash for the bed but now I am sitting with a bed with a huge hole in it and they not being forth coming..I have no idea now what to do as the bed is new ,going for a month now and have no idea what now..