Over the top HARD

This is our first King size bed and I like a firm mattress but this is too firm for me and my husband. The matress does not seem to conform to the body at pressure points. We have had a very difficult time sleeping. This matress was bought for our second home and not slept on for a year. The second year we moved in full time and thought we would break it in, but no way. We tried to exchange matress but was refused. I brought a matress topper that cost $300, but still too hard. Is there anyone who would like a very firm matress that is like new! I would like to sell it to someone who likes it. I will even take a loss and sell for $800. That is with box springs included! The matress is not worn and has been enclosed in a thick matter topper.