I have not experienced this but a long time ago I used to listen to Dr. Laura when she had a talk show broadcast here. She was talking once about issues with her son lying. She said she fixed it like this...
On the way to school one morning, she told him that she would take him to McDonald's (BIG treat for him) when she picked him up later. He was excited as he went in to school because of the treat promised because he rarely got fast food.
When she picked him up, she did not mention McDonald's. She drove right past it on toward home. When she drove past it, he got upset and said,,,,wait, there is McDonald's, you said we would go today.
She said she looked at him straight in the eye and said "I Lied".
I thought that was a good story about turning the tables on the lying so he sees what he was doing.
Just a thought.