Edblo beds not up to standard and bad service

Best home and electric sold me an old bed I bought an Edblo bed at Best Home and Electric and the bed is not up to a satisfactory standard, I had a painful body because of that bed. It was sagging and making noise since the first night (30 June 2018) and I went to the store in a Monday to report that. The manager told me to keep the bed and come back because the bed has warranty and I did because I didn't have anything to sleep on, he later after a week told me that I can swap the bed but I refused to take the same product because they all felt the same. I got fed up of this and told him to fetch the bed from my place and he did after a while and he kept on telling me that he can't do anything without he's RC's command. The 25th of July was the day they took the bed back and still today I haven't received my money or even a voucher as I had asked them to. I even contacted the supplier and they are also dragging their feet... Now must I forfeit my money? That's the question that they never answer