What should I do if I am scammed while shopping while traveling in Hong Kong organized by a travel agency?

Keep the invoices and items as evidence, and then directly ask the tour guide to return the goods (usually the seller and the tour guide are the same). If you don’t agree, sue him and use legal weapons. I have a teacher who did the same. When she went to Hong Kong to buy something and was cheated, this is how she returned it. She is a law teacher.

If you find it too troublesome and don’t have a lot of money, you may consider giving it a try!