Terrible surface, saggy

This mattress is horrible! There are 2 depressions where my husband and I sleep and I can't roll over because it's up hill. We have tried contacting the warrantee people who came and said the mattress does not qualify for replacement because the depression (when the guy comes the surface has sprung back up) is not deep enough and what they measure without being in the bed is all they measure. We have tried contacting Mattress Firm who sold this junk to us and they refer us to the warranted people. They say this keeps the, fair and impartial. The store manager does not return our call. Aweful experience. Terrible mattress! Wasted money.