Simmons mattress/box springs / sagging in first week of delivery

I bought the floor sample bed set, regularly $1699.00, on sale for $1018.25.
You must agree this is a fairly high price for a bed set... at least high enough to expect good quality for ... let's say... 1 year.
Within the first week of sleeping on the bed I was on the phone with The Better Sleep Store. I told them the bed sagged in the middle so much that when I made the bed and put the bedspread on you could see the droop. Surely the mattress should bounce back up and look "sharp" after fluffing and pulling the sheets and bedspread tight... at least for ... let's say... 1 week.
No, she says, it is supposed to mold to your body's shape, and in NC beds are "no return".
That may be, but my bed looks like it is 25 years old after I have fluffed and pulled everything tight... and it is 1 week old.
I called several more times, complaining, requesting something be done. They listened politely but did nothing.
Now I have lived with the damn thing for a year. It has not been something I got used to, adjusted to with time, etc.. I have been disappointed and uncomfortable EVERY NIGHT since buying it in March 08. I went to a nice store and bought a very nice bed so that I could own a very nice bed. I have been sorely disappointed since the 3rd day of owning it.
I wonder what this company can say or do to resolve this $1086.98 problem?
For $1000.00, I should be enjoying this thing for at least a year, don't you think?
I enjoyed it one night. The next morning it was squished and old looking.
We have both been sleeping on a SLOPE ever since.
REALLY REALLY REALLY something should be done by the company in response to this.
Sincerely,
Tracy Horton