Check the licence yourself
Ask the company for its trade licence number and check it with the economic department of the emirate it says it is licensed in — in Dubai, the Department of Economy and Tourism (DET), still often called the DED. Make sure the name, the activity and the expiry date on the licence match the company you are dealing with.
Car rental, airport transfers and other transport are also regulated by the RTA in Dubai, so ask for the RTA permit too.

