Poor Service from Bravo group and Mattress King

I purchased a Sealy 25th anniversary bed from Mattress King on the 22/11/2017. The bed was delivered a week later. The bed was a problem from the first night I slept on it, it started to sink and was really uncomfortable, I advised Mattress King about it and they told me I need to deal with Rachel from Bravo group. To date Rachel has not contacted me. In January when the factory opened I contacted them again and they sent out somebody to have a look at the bed. According to his findings the bed is meant to do that. I let Mattress King know about this but again they did nothing. I contacted Bravo group again and lady by the Cherilee Kenel started working on my issue. She then advised to go into the Mattress King and try out the Sealy 25th anniversary gel bed. Mattress King didn't have stock of it for me to try so I settled for another bed. The cost was slightly more but my salesguy Dane said they will sort it out. This happened on the 20/04/19. No feedback again from both companies, I contacted Bravo again and asked them whats going on and I was told that I need to pay the difference for the bed. I let them know even before I purchased the bed that I currently have a neck and back issue and I needed a bed that was suitable for this condition, and I refuse to pay the difference because since I got this bed I have been paying for medical bills due to this faulty bed. Bravo refused to settle so I contacted Mattress King again and chatted to Dane sent him pictures and emails with regards to this. This was yesterday at 8:15 am he promised to call me back before 12noon with a solution to the problem. He didn't, I called him back at 3.30pm he didn't take my call. I also sent a message and I got no response. I am now at my wits end about this issue, I think its only fair to say, if both companies insist that I should pay the difference on poor workmanship and **** customer service , then they should be liable for the R27000 that I have paid on medical bills since February this year.