Rooms To Go review: Serta adjustable king size bed

Both twin size mattresses were replaced because my husband side started to dip almost 3 years later. I didn't have a problem on my side. So they have me credit of 2200.00 to pick again. They no longer carry the same mattress, so supposedly they gave me a step up from what I had. Not True. Mine was so much better, and the ones that felt the same cost thousands more. I had to pay 711.00 more to get it. They did deliver and it was really hard. It started to hurt my back the 1st night. They had back Surgery and that's why we bought that bed.
I told them I had to return it because it hurts my back. They said I had to keep it at least 30 days to give time to get use to it. I didn't want to wait that long because a week after getting it my back started to hurt really bad. I bought a topper for it, and it helps, but not enough. I had to go and see my doctor and now have to start Therapy. What took almost 2 years to recover from took Rooms to Go one night to screw up! I cry every day because of my pain! I am calling tomorrow because I CAN NOT SLEEP ON THAT BED ANYMORE! Who can I speak to that doesn't give me the round about returning it and getting something just like the one I had. The employees can only refer me to mgr. And management there is worthless. SO NOW WHAT?