Sleepy's sagging mattress Internet

We have purchased many mattresses from Sleepy's. The mattress we replaced we had owned for 14 years. After we had it delivered, we noticed it was sagging after just one month. Sleepy's sent an inspector out and had it replaced. The new mattress started to sag just as badly as the first one. When we complained, they routed us to Mattress Marshalls and they sent an inspection kit. After waiting two weeks plus, we persued them to find out that they referred us back to Sleepy's. Sleepy's said that the mattress sagged only an inch and that was not enough. I believe that the fact that it was sagging at all to be enough. I was willing to upgrade the mattress, but after all this nonsense I want my money back, and I want nothing to do with Sleepy's ever again. I guess it was just a bad deal.