Accepted one click agreement, company asking for money as fine

About 6 months ago i got a call from slenger outsourcing company to work online from home. they asked my aadhar card and my phone number. thet said u have to click on the link provided in the msg to verify your phone number. when i clicked the link it was just blank page. after that i got a msg that u accepted the agreement. then i called back and said that niether i have not read any agreement nor signed it. they said you will receive a copy of that by post. when i recived the copy and read it. i disagreed that contract and not signed it. they asked that you have upload a copy of that after sighning if u accept the contract. which i have not done. now they are calling me and saying that there is legal cour notice that you have to pay 7 thousand rupees much more. What shoud I do now?