Electron Company, Adv. Karan Krishnan, Adv. Minhaz From Gujarat Vapi And Rubi Shah — they are threatening me to pay 9400+4500 rupees through a legal notice.

Sir, i got a call on 20/12/2019 to work for electron company. The work was to fill 1200 forms in 8 days with 90% accuracy. I shared my aadhar card, and digital signature which they put on the agreement stating that if i fail to submit the work on time without 90% accuracy then i will have to pay 9400 rupees as penalty. I submitted the work on time. And i am sure that it must be 100% accurate because i checked it 3 times. But on 31/12/2019 i got the call from company they said that it is 82% correct so i will have to pay 6500 to them to correct the work and then after 4 hours they will refund it with my salary. I refused to do so. Then after 3 hours another girl from company called me and said that my accuracy was more than 82% but not 90% and she denied that the first call was not from the company. Then she said that i will have to pay 9400 to them otherwise they will take legal action. Now on 2/1/2020 their advocate karan krishnan sent me email and tried calling me but i did not pick the phone because i was scared. Today on 3/1/2020 another advocate named minhaz from ground floor 17 kalpataru colony, vidhuti hall lane vapi gujarat -396191 sent me a legal notice threatening to take legal action against me. And asking me to pay 9400+ 4500 rupees (It is written that i have to reply within 7 days). What should i do??