New bed and this one is ready for the dump

I bought this bed about 6 months ago, first two months it was the firm bed i paid for but now it looks like a steam roller ran over the one side of it. It feels like it has a gravitational pull to that side since it is so much flatter and has no support. I have a pillow under the mattress in the middle edge and it still is sagging. I paid cash and ask for a firm mattress that would last and I will be taking the mattress store on camp bowie and las vegas trail and the manufacturer to court on deceptive trade practices. I can recoup my losses three times this way. I called the store and they were like blow me off and get me off the phone. No court will side with a company that sells you a defective mattress that only lasts 3 months. The box springs still has the plastic on it. You should see the pictures, it looks like it has been run over by a steam roller. This mattress is a piece of dodo. I ask for a good mattress and a firm mattress. I did not ask for one that expired in three months. I am not a fat person nor do I have other people sleeping in my bed. This is the worst mattress i have ever seen. I promise you I could have picked up one off the curb that would be better than this. Oh, the store delivered this to my house and it arrived on top of a car top with the driver and the passenger holding onto the mattress and box springs to keep it from blowing off. I should have sent them back at that time. Not a very professional way to do business or deliver mattresses.