S O Service — issue about s o service.. demanding send a money

They sent me threatening email that they had file a case against me under section 73-74-75 and demanding me to send money of rs 7524/-,
I pay 12510 but again advocate demanding 15580 or case under legal action... He is sending a sms..
Plse help me

I am attaching a screen shot
Sir,
Mene net pe so service ka data entry dekha. Gmail add kiya. Usne call kr k. Mujhe kese kr k mera id prof le gaya. Mujhe pata b nhi chala agreement sign kr liya. Or abhi mujhe call sms aa rahahe ek advocate k tarap se legal notice. Me agar paisa na dun to case ho gayega esa likha he.
Please help me. What can i do?