Textron It Services — fake data entry job and blackmailing

I applied for the job, and accepted the agreement as i thought it was genuine. The data that has to entered are of overseas bank account details and the amount in them (Which was more than 20 million dollars in each account). After the first day of working on the job, the site broke down and it was not working. I messaged the person who sent me the work and also sent a mail to the person to whom i signed the online agreement. There was no response for the whole 10 days. And later they were saying that it was my responsibility for not contacting them and i have to pay 3400 rupees. When i refused they are blackmailing by sending a legal notice.