Csr — company asking to pay penalty

Address:

Latur, Maharashtra

Greetings sir/mam,
I am a student and i was searching for some freelance work online. I recieved a call some days ago by the company named csr. They offered me captcha filling work to do and sent me an agreement to sign digitally. The job was basically to complete 10k captchas in 10 days with 9k captchas to be correct. I registered with the company and they sent me the link to start the work. I installed their app in my phone but the i didn't got the work. I finally got the work the next day and started doing it. After working for a couple of days i called up the customer care helpline inorder to know the total work i've done so far. They told me to open the report section in the app and so i did but it was always showing 'no data found'. I again called up on the helpline and i was told to mail the screenshot and so i did. I recieved a reply reading that the report will be accessible in 48 hours. I was constantly doing my work. After 48 hours i called again and got the same reply and i mailed again but it was of no benefit because i could never see my report. I completed my work on time doing manual calculations since the report wasn't there. Now when i called up the company helpline regarding payment and i was told that i will recieve a call from the company. I recieved no call but today i've recieved a mail from a person claiming himself to be a lawyer asking me to pay the penalty money of 5000 or else i will be in big loss of money. Please help.