Englander Mattress

I purchased an Englander mattress in 2011, having gotten the misimpression that this was a small, family owned American manufacturer. The mattress began to sag badly right away. Thanks to the intervention of the store where I bought the mattress, they eventually agreed to replace it, BUT only after making me pay approx. $ 200 to have it driven by truck from their then-​headquarters in Massachusetts instead of from the local store. The driver would not take it past the curb, leaving my daughter and me to drag it up to the second floor of the house. Also, they would not remove their defective mattress. The replacement mattress is as bad as the first one, and I see that the store where I bought it no longer carries this brand, doubtless because of the complaints. I wish I could attach a picture of this saggy mattress. No amount of regular rotating and flipping the mattress will correct the sags. I wake up more tired than I go to bed because of the discomfort of sleeping on this mattress. I am ready to cut my losses and buy something new once I do better research this time around.