Refused to withdraw from this account

I have become yet another victim of scamming people ie Emmett and Billy Sanders who have lured me to deposit 250 USD into Metatrader 4 account number 802492432. I have followed their instructions and guidelines whilst the trading was continuing I noticed that I had tripled my profit and I informed Billy Sanders that I would like to withdraw from this account and he sent me the withdrawal forms of which I filled it up and sent it back that was the last time I heard from him...I am heartbroken and devastated because I had previously informed Billy that my source of income had challenges and I relied on this profit to pay my kids school fees. Please assist me in getting what is due to me.