I was working for deVere for 6 months in Dubai, bringing in regular business (only I had survived from the 16 on my training course). However, when I went on holiday back home for a week, they cancelled my visa (which I had paid 1000 pounds for out of my own pocket), put a 6 month work ban on me (so I can't work for anybody else in Dubai for 6 months) and my boss spoke to all of my existing clients to try and get them to invest more, basically stealing my business.
I was forced to fly back to the UAE to cancel my visa in person, as you're fined ridiculous amounts if you don't cancel it in person.
Just some advice - Do NOT come to work for them in the lawless place that is The UAE.
You WILL be doing very immoral things to your clients and friends, you WILL end up getting shafted, and you WILL end up out of pocket. Get a proper job, don't do this.