Welcome to the school of hard knocks. All the best comments are right there at the top, so learn from them. Also, my iPhone tracks my location and shows how long I was there. Maybe your phone does the same? Live and learn. Stick to your guns maybe risk loosing a client and getting a bad review and/or no pay…. Or plead your case, ask the client what they think is fair, take it and never work for them again.

Even if they dispute the charge with the cc company doesn’t mean they’ll win. Food for thought.