aaac

I am sorry to hear that you have been cheated like this.

To answer your questions, if Lydia was still an employee of the TA then they are responsible for reporting the fraud not you. On the other hand since you do not seems to have a receipt from the TA, you are not on a perfect ground to pursue the matter in court. But you seems to have the e-tickets but I did not see the ticket fees section on the ticket. If you do have that on your e-ticket then you have a good chance to take the TA to court as the ticket is considered paid for.

Note: Your e-ticket still show the names of the passengers, you would want to blank them out.