Frox Enterprises — frustrated me with the information and treading me to force me to pay what they what

I got a call from this company on 26 November and they told me that I have applied for data entry job on quickr they told me that they will pay 20 RS on each corrected form and told me to sign an agreement as I needed job I signed it . In this agreement it was mentioned that . I completed the form filling with accuracy within the given period i.e on 5th dec. On 11th dec i received a call I logged in then after sometime it showed my QC failed . I called the person who someone called me for this job but he didn't replied. After that I thought it was a fraud and I forgot whatever happened because I knew that I won't get my salary . but today I got a call from one Advagate he told me that the company is going to take legal against me if I didn't pay 7300 within 48 hours because I didn't submitted the form with 90% accuracy . They were continuously threatening me of taking legal action if I didn't paid the said amount. Their advocate is forwarding to me legal notice and all .
Please help me I want to get out of all this matter