Pathetic Service

I Purchased an Aerospace at Homemark in Ladysmith in August 2015. I used the bed for the first time during my holiday in Cape Town last December. On the second day of using the bed, the bed swelled up and was extremely uneven. The next morning I took the bed back to Homemark at a Game store in Cape Town to be exchanged. To my dismay the very next morning the same thing happened to the bed and it could not be used for the rest of my holiday. When I returned from my holiday I tried returning the bed @ Homemark /Game in Ladysmith and I was told that I cannot return the bed because it was past the 7 day period. I then asked to speak to the Homemark manager and was promised that the manager will call me back but did not. I went back to Game last week and again I was promised to be called back by the manager. I'm disgusted with the service I received. I do not want this bed and Homemark are refuses to refund the R1200 that I paid. Do Homemark customers not have the right to be treated fairly?. I demand sumone call me immediatly