O Tech — o tech company is harassing me for money

O tech company called me, and gave me a part time job offer.
I completed the work, but then a lawyer called me and told me to pay a penalty, i paid so, but again and again they are calling me to pay more money.
Repeatedly they are asking for more and more money, i am a student and i am being harassed mentally.
I am not able to concentrate on my studies.
Please do something.
Should i report it to the police?
Please help.