Unable to Withdraw

I was tricked by a man who posed as a manager who would help me that after a role with his instructions I would be able to earn what I liked then, but after each role he had a reason to invest more. When I tried to withdraw some money from www.cowtrading.com, I saw that this was not possible and they ask with different reasons to add more funds.
my two request has been standing for week for payment and they do not want to confirm it Host over $20000 and $30000