Sleepy's Mattress Mattress warranty Pompton plains New Jersey

We purchased a $3500.00 top of the line box spring and pillow top mattress from sleepy' Mattress 18 - months ago. We both noticed we are waking up with sore backs. I looked at the mattres while my wife was sleeping and couldn't believe how much the mattress was sagging. 

we went to our local sleepy's Mattress company the salesman advise us to call the mattres warranty company to get a mattress warrants kit.  They sent it out to us what a joke that is. You have to run a string line across the mattres and take photos of the sagging mattres. I called and explain that we have a plillow top mattress  and when you are not laying on it you can hardly see any sagging but when you lay on it you get a 6"-8" sag and mind you my wife is only 140 pounds and I am 180 pounds. 

i sent the pictures as per kit instructions and as I expected they said the mattress is fine. I told the person on the phone how can you see a sag in a pillow Top mattress. He said you can call sealy mattres and take it up to them. I told him I purchased the Mattress from sleepy's and it is not my responabilty to call the manufacture. this warranty is bogus they do not stand behind their product. Now we have to go out and buy a new Mattress. 

We are having a 4- bedroom townhouse built at the NJ shore and will not purchase any mattress from sleepy's 

consumers beware look at sleepy's reviews first  I wish I did