[Resolved]  Rex Enterprises — threatening to pay money or they will take legal action against me

Address:	24-B aagam Avenue, Muktanand Marg, Vapi, Gujarat 396191
Website:	survey-report.us

Hello, i have taken work from job on 24th october, 2019 from rex enterprises to fill 1200 forms within 8 days. My date of submission was 1st november, 2019. As per agreement, i have to achieve 90% accuracy of the work done or else i have to pay ₹4300 to the company. I have completed and submitted the work on time to the company. After few days company mailed me that my qc report is failed. It means i have not achieved my accuracy level. But i visited the site and logged in on my account to cross check my wrong forms. I cross checked the wrong forms with the pdf which was generated after i had submitted my to the company.
After cross checking i found that i have achieved my accuracy level. I mean that 90% of my forms are correct.
It is the rex enterprises who has made changes in my forms so that i will not be able to achieve the accuracy level.
They cheated me by adding a space between words in "postal address" column.
I mailed to the company all the above things with the pdf file. They gave same reply that my qc report is failed.
Today i have received a mail and call from their advocate telling me to pay the respective amount to the company or else they will file case against me.
I don't understand what should i do
Please help me and guide me
Thank you