Scammed by bitcoin

A lady who works for bitcoin called Fancy who assisted me in investing took advantage of the fact that I've never done trading before I was to invest R2000 and I did so she asked for my banking details and personal information I gave her grannies Capitec account so she can make transfer after my payment I was told I'd want I refund if I want to and then she asked for more money and took R3500 from my grandmother's account to make R5500 in total when I wanted the money back she refused saying I should send her more money and I told her I only had the 2000 I sent to her