I NEED HELP WITH WEDDING DRESS!

faith • Hello, everyone!

My wedding dress has been altered twice and still has never beem fixed properly. My wedding is this Saturday and it still is not fixed. I need recommendations. So on the lower back part of my dress, sense my arch is so dipped it does not hug me like it should, its a mermaid dress, the hips and bust are fine and it hugs my waist its just my lower back that has the extra fabric I need help please. I don't know what to do!