if your visa is working, you can't go out of our airport without OEC and to get one, you need a contract. If you have a friend working in a recruitment agency, try to ask how to deal with your situation, having a work visa but no contract to show the authorities at the airport.

Your case is a "chicken and egg" condition. Maybe business visa will be easier! I hope I'm wrong and you can go out and arrived here safe and without hassles!