Jexmon Solution — fake agreement for data entry job and threatening for money.

I looked for a part time jobs in quikr application and then i got a call from jexmon solution on 31/8/2019 asking for my id proof. I gave them my passport size pic and driving license photo in whatsapp and they gave me a work agreement. Later on same day i call them to cancel the agreement they told to pay 5000/- for agreement cancellation which i paid on 3/9/2019 and they send noc letter to my mail id. Then today they call me and demanding more 10000/- otherwise they will take legal action against me. They are making me mentally harassment. Pls resolve my problem.