To make sure that you are going to book your holiday tour trip passing the ligitimate tour company of Thailand, you can check the trustworthiness and registration in Department of Tourism by the following steps
1. You go to : http://220.127.116.11:8087/mobiletourguide/info/license/tour
Click the detail button as the picture
The following picture will shown up.
4. Put the registration number which you have got from the company in the window, (or use the name of the company) In this exapmple used the registered number of Jc.Tour.
5. The search result of the tour company will be shown as the following.