They won’t let me withdraw but keeps asking me to deposit

Through a person who claims to be a foreign exchange trader, I downloaded the KVB’s app. He then let me deposit money and work with him to trade foreign currency. For the first time, I lost all my deposit, and the second time I earned it back. Then I thought I should stop doing it, but he told me that my bank card number was wrong, which stopped me from quitting. I endured it since I saw that one number of my bank card number I entered was wrong. He asked me to deposit 40% of my account balance to modify my bank card information, so I deposited 45,000. As a result, when I went to withdraw money after I modified it, I was told that my account was frozen and I was not allowed to withdraw money. If I want to unfreeze it, I need to pay 30% of the account balance: (the original balance + 45000) * 30% = 46000. If I don't deposit money anymore, they would insist that I can’t withdraw, and tell me that there is no other way to unfreeze. Finally, the customer service directly ignored me. I asked him how to contact the leader or the website, he kept silence.