Softech Erp Solutions — Complaint about data entry work from pdf to word conversion

I had to complete the work of data entry project the client hired me from freelancer and then they told me to contact them through WhatsApp . Later they asked me to some about for work to be assigned and they said they will return the money after completing the work.then after completing the work they again took some amount in name of gst .later after all completing the work money paid also they are not giving my payment niether they are contacting me. Please help me get my money back a sum amount of 5000