Angry and disappointed customer....

I'm so so disappointed and angry about the bed service I got from the The bed shop Fourways branch. I bought a queen bed online and within 2 months the bed was shallow on one side and it started making noise. I phoned head office who referred me to Fourways branch because they delivered my bed. They were willing to help me at first, we even agreed on an exchange for a better bed with a higher amount and I was willing to pay for the difference and new delivery fee.They said I should come to the shop and choose another bed, I did exactly that, while I was choosing the bed, I was told I shouldn't choose certain beds because they were not good quality. So I didn't understand why they were selling those beds from the first place. Anyway, I choose the bed, which was more money and then I was told that the manager will call me and I might be charged for usage, which they failed to mention when I made the complaint. . No one called me, I had to call myself, then the manager told said " sorry mam but we can't make the exchange because the bed is a basic and the warranty is 3 months" little did she know that the warranty on the bed was 6 months and I saw it. The bed was for guests but not even a child can sleep in it. Its clear to me that they think I'm a fool and that they don't care about their customers. I'm so angry....I wont let this slide ,never....why would you sell beds that no one can sleep on.... Im not happy at all