Water in Basement - Help!
The sump pail is there precisely because you can't prevent water from coming in, at least under the slab. It's unclear whether your home has foundation waterproofing installed. 

It's also unclear why two sumps couldn't keep up. In all but the worst scenarios, one pump should be adequate, and it should only run every few minutes at most. If you have pumps running constantly due to moderate rainfall, you have bigger concerns. Is the landscaping around your home sloped the wrong way? Does your neighborhood's topography result in heavy flow through your yard? Is your home located in a lake or pond? 

I do appreciate that you thought to mention the makeup of your ceiling. That successfully conveyed the scope of your problem. Unfortunately, a sump pump won't help if the water gets that deep.