Keydus Technology — fraud and fake

I got a call from va class (Maharashtra) around 20th may 2018 for a job. I dont know how they got my no.. At that time i have cut their phone and this continues for almost 3-4 days.. Then one day i have picked up their call and they offered me a virtual assistant job with their terms and conditions. I refused to accept at that point of time then they have said please send one id proof. I have sent them my aadhar photocopy. Then they have mailed me a contract which i didnt sign. They said we will take a test of yours if you fail you will have to pay a sum of 5100 rupees. I said i dont want to do this. But they keep saying the exam is very easy you aregoing to clear so i send them i agree mail. But they have said if you find the study material tough you can cancel the participation and i did that. I have cancelled it but now after 18 days they are calling me again and again and asking for 6100 rupees for not giving the exam and are mentally torturing me for a penalty of 50000 rupees. I belong to a very middle class family and i didnt have a job from last two years even after completing my graduation. Please help me in this matter.