Unable to withdraw

I deposited money to numerous account, what is shocking me is that they telling me that they can't transfer my profit because I got insufficient balance in my account, to my surprise, how they know that? I gave them my account to deposit money into it also they wanted my email address which I gave them, now they telling me to deposit into my account another R500 so that my profit could reflect, how is that possible? I already deposited R2000 into 3 separate account. Kindly explain and help me in this regard