Does not allow to withdraw my investment

https://fxfinancetrade.com this platform supposedly does trading for you and after 7 days they would give you double your investment and you have to pay a 15% commission, but at the end of 7 days they did not allow me to withdraw my investment No earnings, they told me that I had to make a deposit of $300usd to be able to withdraw. the person who supposedly trades for you is still trading on facebook.

The following is the original recommendation

no permite retirar mi inversion

https://fxfinancetrade.com
esta plataforma supuestamente hacen trading por ti y al cabo de 7 dias te darian lo doble de tu inversion y tienes que pagar una comision del 15%, pero al termino de los 7 dias no me permitiero retirar mi inversion ni ganancias, me dijeron que tenia que realizar un deposito de $300usd para poder reitrar. la persona que me supuestamente hace trading por ti sigue en facebook operando.