Back problems due to poor quality bed!!

In January 2014 we bought a queensize Forty Winks bed. Very nice! Sleeps wonderfully. But after about 10months the bed had gullies in from our bodies, although we turned the bed regularly. The base also squeeked. We then started the process of having the bed replaced as it was still under warranty. What a process to get assistance. Eventually they replaced the base and fixed the mattress. One night on the bed and the gullies are back :( So the fight starts again. Eventually after waiting about another month (an also buying another double bed for our daughter) our new bed is delivered. This one is like a table. The base squeeks. We are not getting proper sleep and my back is in such pain. (I had a back op 10 years and hadn't had any back pain since) now the back pain is back. We are very reluctant to start this fight again, but will have no choice. This bed cannot even be flipped as the other side is basically a board with material over. This is NOT what we bought in the first place. I am now considering legal action as I now have back problems again. Who will pay for my medical bills now?! I hope someone at Dial-A-Bed reads this and does something about it!