Problem with soft body

Hello! I’m learning to use the game engine and I did a very simple game. There is a ball (rigid body), a wall (soft body) and a plane. My problem is that I want the wall remain in his original position when the ball hit it. The only way that I found is setting the wall in “static” but this is not a solution because in that way my wall turns rigid, and I need it soft.

I need to fix the base of my wall to the plane (ground) but I don’t know how. Thanks for your help.