Plush Mattress "Wore Out" in Under a Year

I bought this mattress because the salesman said it would support two sleepers. He is 240 lbs, I am 130 pounds. This mattress has a top layer of smaller coils under the comfort layer. It slept well for the first several months before we noticed it was bowing in where he slept so we started sleeping on opposite sides. A few months later the bowing was so bad we had to move to sleeping in separate beds. Now I cannot even sleep in it alone without experiencing pain in both hips. It usually goes away once I get up and moving around, but it would wake me up in the night several times. I bought a 3 inch adaptive foam topper and it is only helping marginally. I am a healthy person who exercises daily, drink water, take calcium, eat healthy, etc. I have no known issues with my hips or spine that would cause this problem. As this bed is so plush, it was never used for anything but sleeping. I am very disappointed with this purchase and the handling of the inspection, warranty, etc. The inspection report said the mattress only has normal body indentation. As I was in the room with the inspector, I saw 1.5 inches dip on the top layer in the middle. The report said it was an overall indentation and less than an inch, which is not at all accurate. I called the Aireloom company and talked with customer service, I also called the mattress store I bought it from. Everyone is very apologetic that I am having these problems with my expensive mattress, but the problems aren't covered under warranty. And the mattress store will gladly sell me a new and different mattress with a nice discount on the price. I'm literally in tears at this point. It took me months to pay off this mattress and the monthly payments were very steep. Not easy to take for a retired person.