Sleep Country Canada

I bought Kingsdown Hayworth Duet mattress 9 months ago from Sleep Country. The MRSP for this mattress is around $4000. I paid ~ $2000. I thought I was getting a high end mattress. It is the worst mattress I have ever had. Every morning my wife and I wake up with terrible low back pain that is so bad it hurts to bend over the sink to wash my face. My wife's pain is exactly the same. The store told us the mattress has sagged and we went thru a lengthy warranty procedure and mattress measurements but at the end our warranty claim was rejected because the mattress has not sagged enough for them to replace it. Now we are stuck with this expensive painful product. I'd avoid both Sleep Country and Kingsdown in the future.