If you have taken this visa on your name than ur on work visa. If its so than u need exit permit. And if u leave job u will face ban 2 yrs for work if no noc. U can go out with help of embassy. But for work I think u can't return till 2 yrs of last exit. U can come back on visit visa. If u think u been cheated u can go to labour department and court. They can help. If no I'd yet u can ask moi or labour department regarding ban period. May be exit permit will also not require if no I'd but I m not sure best way is to take ticket and ask to moi department at airport that u want to go out and whether they allow or exit required? There u will know abt exit permit. If they allow than u free or else go to embassy.