keep demanding money

I started to deposit R1000 and they said I must deposit another one because that one is small I did so deposit another R1000 after 1 day this girl who was helping me said I can withdraw I did so and I made a mistake so she said I must pay R3000 because my account is frozen I did pay it after some days when I asked about withdrawal she said I can't withdraw because they lost signal on my account I have to pay R5250 in other to retrieve it I pay that amount on Saturday she took another R3200 says