Unable to withdraw

Deposit 480dollars and withdraw 300 dollars after making profit. The account still has 456 dollars, but it cannot be withdrawn. The profit was not given nor the principle. The email was not replied. It is not understandable. They should at least provide an explaination for the problem. Such a big company, should not do it to my principle. My trading account is 6194684. I hope to resolve it ASAP.