Not to armchair quarterback this or anything but.... this sounds like a pretty simple problem to fix, WITHOUT spending a bunch of money. dig up a few feet of soil around the house (they said they have an excavator), put down a geo-membrane sloping away from the house, install a primary and backup drawdown well pumps (I forget the correct term, but its what is normally done around landfills and environmental hazard sites) to pump out water that manages to get through, and cover it all back up with proper surface drainage to remove as much water from the ground cover as possible. Water coming in the front door, may have to think about an above ground roof covering for that, or a removable storm shutter, or additional pumps. Keeping water out, even fixing old water infiltration problems, is civil engineering 101. They called a roofer and a concrete worker to fix a civil problem.