Scammers Strategies.

I had a bad experience in Forex Trading. After depositing $1000, I made a profit of it. As I need to increase my capital so i deposited additional 1000$. I opened couple of trades and I made some profit but i lost more till 500$. Now this broker is asking to invest additional 2k$ which I told him I don’t have since then I haven't received a call from him. And now My account was on hold and I was unable to make a withdraw the profit from my account.