I was incited to deposit but unable to withdraw

Someone advised me to invest in foreign exchange. At first, the requests for withdrawing were all approved. Afterwards, he asked me to advise others to join in together. Soon, I was told that my business was abnormal and that if I wanted to withdraw my money, I had to repay 10% of the capital and that I could get it after 48 hours. Finaily, I was unable to contact with the customer service personnel. When I kept in touch with the one who advised me to invest in foreign exchange again, he said he would like to help me withdraw my money. That was totally a trick!