Leah Remini I did not get paid after doing PI work New York New York

I am a Private Investigator. I was hired by a member of the Leah Remini's family in Los Angeles to follow her while she was in New York City doing what it was apparently some filming work. After doing my job and passing on the report, I did not get paid at all. I was told the work was not good enough and that the fees were too high (even though we had agreed beforehand to the amount). I am now short of money not only for the work I did, but also for the travel expenses, hotel, flight, etc. Anyone has experienced anything similar with Leah Remini's family? Any suggestions?