Though one could argue that you should not have concluded a deal like this at what seems to be arms length (where the danger always exists that you get taken for a ride no matter where in the world you are) I would not let this guy get away with it and find yourself a more reasonable lawyer!!! I would also have no hesitation exposing this guy as he will deserve all he gets - he cannot be allowed to take people for a ride - the industry must stick together. I would take this guy down big time
