Crossway Technology — threatening and demanding money

Dear sir,
I got call for online captcha filling work. They asked me for id proof and when i send them they make false agreement with it. They gave me work to fill 12000 captcha in 12 days. But when i started i saw captcha was not properly visible and amount of captcha i am filling was not mentioning so i called them but they were not answering. After 12 days a person called me and said i am advocate and a case is filed against me and asked me for money rs 6000 penalty charge and 1950rs for cancel case against me. I paid them 7950rs so again they called me and asking me for rs18950 to complete cancel the agreement they will case againt me. I refuse to give that amount they call me again and again ang threatening me and forcing me to pay the money.
Please help me to out of this i will thankful to you..
Thank you.