Gvs Technology — threat and harassment

I applied for this company on quikr.com on 11.03.20 recieved a call from the company the next day. They told me how i have to do the work and stuff and sent me an agreement. I kept on asking them that what the work is all about and if i don't want to do the can i cancel the women on the phone said yes cancellation is free and can be done without any issue. Then she started the job without telling me and then called me. I asked them to cancel the job because because of some reason and then they asked me to pay 6700 for cancellation the job or they would send a legal notice. First of all i didn't start doing the job and without doing the job without registration they're asking me to pay the cancellation fee. Look at their audacity because no company does that i'm an employee and it's completely my choice to do the job or not. And now after a long month they're calling me again and threating me to pay. Please do look after this problem and resolve this as soon as possible.