online job fraud

i am searching online job than i found with one company then i see in google that company is fraud so i want to cancel my work than i tell to company that i want to cancel my work then they told you have to pay 5200 pay for ur work cancelletion than i did it then they told if u want to pay cancel agreement you need to pay 6300 rs i am denying for that then they send me mail you need to pay 25000 something amount for close your notice otherwise we will take legal action how can i come out from this case?please help me on this.