First of all, I'm very sorry to ask about your experience, but please understand that no matter where you are, there will always be black-hearted businessmen who will try their best to stop you from returning goods and not letting you take money, especially since you have left Hong Kong.

I don't have the address of the store, but the normal invoice in Hong Kong will have the address of the store. You can have a look. If you don't even have a receipt, you can't prove that you bought something in the store. Even in regular stores, it is difficult to get a refund.

In addition, you can go to the Travel Industry Council of Hong Kong to check out the "Refund Protection Scheme for Inbound Tour Groups". If the store is included in this plan, you have a better chance of getting a refund. Even if the store is not included in this plan, you can call the Travel Industry Council of Hong Kong for help, and they can give you more advice.

Give you some advice on your future travel. Tour groups should also make money. If the tour fee is too cheap, people must make money from other sources. So when you go out with a tour group, you must find a reputable tour group. In addition to the tour fare, you should also try to ask about the itinerary.

Finally, I apologize to you again and express my sympathy.