Myc — Captcha fraud

I applied for an online captcha job, they provided me with the android application so i logged in the application as they said, but then only i found out the application was not working and the captcha job they provided was a scam and it had happened to many people, so i called them to cancel my registration now they want me to pay them a fine of 6900rs, pls help me during this corona time ihave no money to pay to them . They blackmail me through mail, messages and calls ..pls help me