Work Saturday or get no more shifts.: opiniones de empleados con el puesto de Hgv Driver en ADR Network

I was told to work Saturday or there will be no more work for me. On returning to client I asked if they had me down for next week. They advised I was not on the list. But they confirmed they need drivers. So agency have stopped me working? I would call this blackmail. Especially when my planner made a threat to my.