Bad mattress

I had an awful experience with this mattress, because it is really uncomfortable, when I wake in the morning I have a back pain and some times I awake in the midnight from the uncomfortability. And I contacted the dealer to come and inspecting the mattress, then they came and inspected it, they said yes it is uneven, and the boxer need to be replaced, and they will contact the manufacturer because it come with a ten years warranty, but after that they sent me a letter stating that your concerns are not covered under the manufacturers warranty!!!!! I spent $797on it, so my money is gone, because I need to buy a new one. So I do not recommend it at all.