Unable to Withdraw Funds from Goldman Sachs GSVC Investment Account

I invested in a Goldman Sachs İş Yatırım GSVC account and participated in an IPO lottery. Since I couldn’t afford all the shares I was allocated, an assistant named M****, affiliated with Goldman Sachs, added funds to my account under the program. I was told I could sell the shares, pay the 20% GSVC program profit fee, and then withdraw my remaining funds.

Despite paying the 20% fee, I still can’t withdraw my money. When I inquired, I learned that M**** placed a block on my account, and shortly after, my account was completely locked.

I have all the evidence—conversations, messages, and deposit receipts. I need immediate assistance to resolve this issue and access my funds. What should I do next? Goldman Sachs, address this urgently!