Fo Technology — about threatening me to pay the amount

Hello,
One day i received a call from fo technology from a person called harshad he said all the details like they will provide 900 forms and need to fill in 9 days for that they said they will pay 22500 and they said no need to pay any registration fees at first and they will deduct in the final amount they said and they said to send a adhar card details and photo and signature but they didnt say that those are for agreement. They send it to my mail and in that also i[censored] will fail to do work or not achieved accuracy u have to pay 4700 they mentioned. I completed the work within time and submitted next day they sent a message that your qc report is released and i checked it is showing failed and i checked my mistakes in that only space was missing. On the next day they asked to pay 4700 and i paid and again they are asking to pay 28850 rs otherwise we will take legal action they are saying we will take legal action plz help me