UNABLE TO WITHDRAW THE AGENT ASKING FOR PAYMENT OF TAX

this broker does not even dare on responding on emails. They have an account manager or an agent that doesn't even respect you as an investor they insisting me to pay an tax even though they have seen an huge amount on my account you can't even have any convenient way as a trader because they just mark my account and order by the agent (un able to withdraw there's an order no audit) its really insane....
its my big big mistakes to register to this broker they taking all the advantages
NOW I DONT KNOW HOW CAN I ABLE TO TAKEN BACK MY PRINCIPLES AND EARNINGS...