Hi, thank you very much for your detailed reply. I chose you as best answer.
Today I actually shared the incident with my former colleaguges. I was working travel agency and handled immigration issues for some foreign citizens which include her participants nationals. We also went ahead and checked the client company. Based on what we found out, we all rearched same conclusion. It would be best if I stay away from this client. So I decided I will move on.
Many thanks for your advises. I will make sure to read everything especailly when I use upwork again.
I hope you won't get same thing I just encountered this time. I learnt lesson.