Depending on the severity of the situation or if you have any doubts at this point, consider bringing in a private professional inspector to determine conditions and make recommendations. Either way, you will want to follow-up with a letter describing the problem and what was agreed to in your meeting. Be sure to include solutions discussed and the timeframe in which you both agreed would be reasonable to complete the corrections. Send it certified mail, return receipt to ensure he receives it. We already knew how dishonest and unethical he was so this didn't surprise us.
Ongoing documentation is critical, including taking pictures of the areas in question.
Then it's time to act. File a complaint with the Contractors State License Board and depending on your circumstances considering consulting with an attorney. If it gets assigned for field investigation, experts will be brought in to assess damages, cost to correct and complete, and reports filed along with citation notices given to the contractor. In the mean time your house sits. Unfortunately, the State does not move through as expeditiously as they should.