Piece of junk

Have only owned this mattress for about a year. The indents on my side and my spouses side are ridiculous! I actually had to go out a buy a large piece of foam to fill the hole where my body lies! (which moves around all over).The store where I purchased the mattress has since closed. I cannot find the receipt but the mattress label shows the mattress itself was made only a year prior. There is a 10 year warranty on the mattress. I contacted Restonic to no avail. They will not budge saying I need a receipt! I have proof the mattress is only a year old! I would NEVER purchase another mattress made or sold by Restonic as they do not stand by their products. It also took 6 months for them to even respond to my complaint and all phone calls were just forwarded to a machine this was all BEFORE COVID)! Buyer Beware! Do not purchase! The mattress will never last!