Stay as far away as you can get from these crooks.
They promised me 5000 and paid me only 1500, claiming the remainder as a fee for storing my belongings.
Then they left me destitute so that I had to come back home, and heaven only knows what happened to my belongings.
All I know is that somewhere in a garbage heap in China, there is a computer containing a thousand-page manuscript which I worked on for ten years.