Account was modified by NessFx. Unable to withdraw

After I deposited in NessFx and profited, my account was modified and I can’t withdraw. They won my trust by chatting on WeChat. The programmer claimed he was experienced and studied abroad who led us to operate. My account was modified during the period of withdrawal. Luckily, I have screenshots of every step. In the end, they said I have to pay ￥68,160.54 to unfreeze my funds. Scam me step by step! Close my app after I was angry.