Serta Vera Wang mattress can feel springs bottom out on

This Vera Wang mattress about four years old was not right from the start. I would have not kept this mattress if it were not for I had already did one comfort exchange. I can feel myself bottom out feeling the firmness of the springs in the mattress. The mattress is said to be semi plush, is a tight top mattress but sleep on it just in the first month could feel my hips against something hard in which that is why I suggested I was bottoming out. I am not a heavy person so that is not the reason for this hard bottom out feeling. Hip pain got worse and ended up trying multiple foam toppers to make up for this awful Serta Vera Wang mattress set. Vera Wang I believe is only the appearance and fabric used you see on the outside of the mattress and none other than that.