Fm Mall — Rs.17599 not given back

The fm mall has taken my money ₹17599 and not giving back .
When I ask for money they said complete the all task .first 3 task order pending only displayed in that website .that task are completed .I tried to withdrawal my amount .but i could not withdrawal the amount .after then they says you have to completed the all tasks for get return back amount & commission.but upto 6 to 7 tasks has completed but again again task is coming.i dont have balance in my bank a/c.They have frozen of my paid amount all task(products).How to return back of my money help me