6 months of complaints about a damaged bed with re

I bought a king size cloud nine mattress in October 2014 and within 2 months the bed sagged worse than the old mattress I replaced. I complained immediately to the Bed Centre where I purchased the bed and 6 months later I am still waiting for the problem to be sorted. I complained so much that the manager of the Bed centre came to check the bed himself and immediately agreed that the bed is faulty and promised to sort it out. 3 weeks later and still nothing has been done because Cloud nine maintain that the bed is perfectly fine. I am now left with no choice but to take the legal route and sue for damages. I intend to claim for a new bed, chiropractic costs and full legal costs, as the service I have received has been nothing short of ********. Stay away from The Bed Center and Cloud Nine beds because they plainly do not care about customer service or satisfaction. The fact that I have to now take this issue to court says volumes.