Onlineworksjob.com — using unethical practices to defraud people

Website: www.onlineworksjob.com

I had received call from a lady saying that she is from www.onlineworksjob.com
And i was taught that i will be paid rs. 35 per entry for 800 entries. This work has to be completed in 7 days. I started work but due to some problem i was unable to complete work and called that lady and described my problem to her.
She says that if you will not complete this work you have to pay rs. 4000.
At the beginning of work i was not told about any such thing.