Passat Wagon Ignition Problem

Help - I can’t turn my car off! When I turn the key to the off position and remove the key, the car engine continues to run. Fortunately, I have a manual transmission so I just leave the car in gear and take my foot off the clutch, but then the battery stays on and is drained by the next time I need to drive. The dealership replaced the ignition but that didn’t fix the problem. Any advice?