A very disappointed and angry customer

I bought a bed in September 2023, the bed's quality is the worst. I want a refund, I don't even want an exchange. I no longer trust the bed shop, it's been less than 8 months and I can barely sleep in it, it's saggy and I can feel springs. I sent this to complaints and the Bed shop Kimberley. They are quiet and I am suffering, they want to give me another bed and I don't trust the quality of their beds at all. I am about 70kg but the way the bed sank, there's no way. I asked if they are to exchange the bed who will bear the transportation costs, they decided to be silent and not answer my question.