Frontech — not paying my amount and asking me to pay rs4500 to them

Address:

324, Galaxy Emperia, Warud Road, Aurangabad Maharashtra, Aurangabad, Maharashtra, 431005

I am Abhimanyu from Indore have taken an online work from the Frontech company
A girl (Rajvi Patel) called me and given the work taken I'd proof and all, , , the work is to complete the 1500 forms with 1350 forms to be filled correct (90% accuracy) within 10 days
I have completed the work which they have provided me within the duration and submitted. After that they generated a Quality Check (QC) REPORT in which there should only contain the wrong forms typed but they added the right forms also to prove me that I have not done my work right . i.e actually there is only 103 wrong forms but they added 160 right forms which makes the total of 263 forms they says it's wrong but I have the screenshots and every proof to claim that I have done the right work and with these proofs I mailed to helpline then they replied you have used third party application to complete the work
Now the reasons changed for them, , , their main Moto is to not to pay my amount
Now their so called advocate started calling me and harrassing me to pay Rs4500 before 1 pm on 13 June 2019 otherwise you have to deal with the court for the further proceedings and their you have to Rs60, 000 for the company's loss also, , , he mailed me ( I will add the screenshots below check this)
I want my amount to be paid at earliest because I was doing this just to continue my study(MBA) expenses
Please do the needful sir as soon as possible.