Binance Withdrawal Problems

I made a Binance account using someone on Telegram and put money in it. Someone told me to put money into a cryptocurrency that was going up in value, so I did what they said. But when I tried to close the trade, they told me I needed to add another $500 to complete the sale, even though I had already put in $245.98 in my previous transaction. After I said no, they blocked me, and now I can't get to the money I put in. I want my money back that I put into the account. If not, I will sue with the help of my lawyer. Can you help me out? I have chat logs with the person we're talking about.