Sweetnight 10" Hybrid Queen Mattress

Item was as described upon arrival, but I have serious concerns about quality. It has been 30 days and I have used these mattresses daily, unfortunately the center of the mattresses have already started bending inward creating a divet in the center. I understand this happens over time, but after 30 days this concerns me deeply. I personally would return these mattresses if I could figure out how to pack them up and ship them.