I recently had a 2nd access door cut for an easier access to my crawl space. The ground level under my home is about 2 ft lower than the ground level surrounding my my home so the brick mason dug down about 3-4 ft (to allow for bottom of floor), cut the door, built a retaining wall, & filled the bottom with sand. The area flooded when it rain and spilled into my crawl space. Then the contractor dug the sand up, poured mortar in the bottom & tried to seal the retaining wall with roofing tar. It still flooded when it rained. The area is built up with clay soil that slopes away from the house. It is not the raining into the recessed area but moreso the water is seeping up through the bottom of the retaining wall or through the wall itself. This project has quickly become an expensive headache. Any suggestions on why this is occurring & how to fix it?