Personal Job Solution — They are forcing me to pay the penalty and mentally harassing me

Firstly I got a mail from data entry job with free registration . They told me to register in their site and upload 500 resume in 5 days . As a student i couldn't complete because of my studies and now they are telling to pay penalty and mentally harrassing me.its been nearly 1 month I left that company but they are calling me again and again and harrassing me to pay the money now also .I kindly request you to solve this problem.