OBT withdrawal issue

in obt trading they have group task.the 1st taskorder amount to deposit cost $150 and they will give 30% commission.i gve them. the 2nd task amount $600 with40% commission.i also give to them.3rd order amount $12000with50% comission.i didnt give them coz i dont have money anymore.the agent said to me.the manager cannot aproved the withdrawal bcoz i didnt complete the task..thats my problem im so depressed and i cannot sleep anymore..plss help me..im lack of knowledge about trading also..