A hot bed that did't last

I've only had this bed for a year and it already had a serious divot in the middle. It's a very hot bed. We bought a cooling topper, but that only helps a little. It's difficult keeping comfortable all night long since you're sweating from the bed side and freezing from the blanket side, because if you try to keep warm with blankets you overheat even more so. I thought I would get more than one year from a $600 mattress. I even had to invest in a $200 custom made base for this mattress. I anticipate that I'll end up going back to a traditional bed ....sooner than I thought.