This is my first post so be nice! We are having our basement water proofed. When taking down the studding to get at the bare walls, right under the window it looks like they just put cement in there because a block would not fit. Well all that cement has deteriorated and fallen out. I am looking for the best way to repair this. Suggestions? I am including a photo so you can see what I mean. I am looking for a cheap repair since this is costing me a bundle already. They are coming soon to install the waterproofing so I need to get this done ASAP.