Usually the wrong solution was installed for the actual source: a coating or partial fix on a hydrostatic-pressure basement, an undersized or missing system on the leaking wall, a failed sump, or a non-compliant discharge that recirculates water. Failed prior work gets diagnosed and corrected here, including other companies' installs.
More detail
A basement that still leaks after "waterproofing" almost always traces to a mismatch between the problem and the solution, and the patterns are consistent enough that we can usually identify the failure on assessment. The most common: an interior coating or waterproof paint sold as a fix for hydrostatic seepage, which cannot relieve pressure and blisters off when the water table rises; a partial-perimeter system installed on one wall when water is actually entering around multiple walls under hydrostatic pressure, so the unprotected walls keep leaking; crack injection on a basement whose real problem is full-perimeter hydrostatic seepage, sealing one path while water finds others; a French drain run with flexible corrugated tubing that has silted shut; an undersized or failed sump pump that cannot keep up during a Cincinnati peak storm; and a discharge dumped right against the foundation or, worse, into the sanitary sewer, so the water recirculates back to the footer or backs up. Storm-chaser crews that flood the Cincinnati market after a wet spring are a frequent source of this work, because they sell a quick fix, take payment, and are gone before the next heavy rain exposes the problem, and their warranties are often worthless. Diagnosing and correcting failed prior waterproofing is regular work here, including systems installed by other companies and by since-vanished outfits. The diagnosis starts the same way every good waterproofing job should have started: identifying where water actually enters and what mechanism drives it, rather than assuming. Then we scope the correct fix, which is frequently a proper full-perimeter interior drainage system replacing or supplementing what failed, with a compliant discharge and a real written warranty. If you paid for waterproofing that did not work, the money is unfortunately often a sunk cost, but the basement can still be made dry by addressing the actual source correctly.