fraud Scams

They asked me to deposit €500 to clear my profits. When I did so they told me the reference number I used was Expired and wanted me to deposit another R4000, I already send a R8500. They refuse to take responsibility, it was their fault that they didn't send the new reference number, when the "Trade Manager" said to use the reference number she send me which was a Standard Bank Luno account,.
Now they tell me because it was send to the expired reference its hanging in the air, refuse to pay back