Permanent indentations "ruts" on each side of bed

So disappointed. It was over our budget but we felt that it was worth the expense if it would be comfortable and afford us good rest. Ten months later we have two "ruts," one on each side of the bed. Yes, the mattress and box spring are supported on bed frame. We purchased an inexpensive Beautyrest Classic set over four years ago for $400 at Metro Mattress and were not surprised that it lasted about a year before sagging occurred. The Kimble Glen was much more expensive and lasted far less than the Classic. With Raymour & Flanigan the Platinum Warranty only covers stains and an exchange within 45 days of purchase. Of note is the fact that we feel Raymour & Flanigan did a bait and switch because the mattress we tried in the showroom was comfortable and provided soft support when we rolled over and laid on our sides. The mattress that was delivered does not.