Prospexiv — threatening calls

Sir/Madam
I uploaded my resume in shine.com for job. A girl from prospexiv company Ruchika called me & give me form filling job without investment .& said to me you have to got 91 % accuracy in your work.I am very confident that I can do this work . I completed my work within time period. & Checked soo many times my work But these people cheated on me.& Force me to pay the amount I have paid all the amount & now after 1 year a person called me & said to me he is calling me from advocate association because of breach of contract I have to pay Rs 30000 but I refuse to pay because I already submitted all the amount now they are sending me sms

hard copy Notice of your ?Breach of Contract? case under the Section-420, has been dispatched at your address, which will be delivered to you within 72 working hours. Feel free to call at [protected] for any assistance as Government has appointed Public Prosecutor to work in your favor.
Please help me what I will do??