I was incited to deposite but unable to withdraw

I had known a woman named Demi on online games early this June. She said she worked in a state-own company and advised me to invest in forex market. I didn't suspect her at first, but afterwards she always asked me to increase capital. Besides, there was something wrong with the official ways of withdrawing. When planning to withdraw, I was told that my account was suspended and was asked to repay a tax of 10% of the capital within a certain time, or I had to repay 20%. With nervousness, I am worried about being unable to withdraw money. Then I remitted the tax. The customer service personnel told me that my account would be unfrozen and If it would not, the bank would compensate me. But I didn't expect that it was totally a trick. After remitting the tax, I can't contact with the customer service personnel, and Demi is gone ,too. That is a purposed fraud.