Job Search Net — Threatening to pay more money

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I am fed up with this company. Because I started the work and within the period I completed my work. Even though the last day of the day which assigned to me they send me a mail, such a threatening mail and ask me to pay even when I have more time left. And completed 600 resumes in the time slot. After that, after 7 days I did not get any updates and I text them, then again they threatened to pay money and when I say no they said to come to court and to need to pay more than 50000. I didn't understand anything and I feared and I paid 5900. And they said that this is a last payment they will not ask any further payment and also said that my work payment will give me. After that I asked for the NOC then they asked whether I will work with their future I said no, then again ask me to pay 5900*3 and 4100 for agreement cancellation. I don't want to work with them anymore. Because of such a workload they give and not helped at all. And also the person who gave the work will not answer any of my questions until it came to the payment procedure. I don't know what to do. Because they really threatening to people to pay them with 30 or 20 minutes. I want my money back.