F O Technologies — continuous harassment through mail & call

Dear sir/ma'am,
I am aurba mitra. I had taken a form filling work with fo technologies on the 8th of february 2019 and the work was supposed to be submitted on 17th february 2019 before 12 midnight, and i submitted the work well before time at around 7 in the evening.
Still i got a mail from an advocate stating that there has been a breach of contract on my part. I got the mail in the morning but received the qc report later that evening. According to the report the qc is failed but everything was correct from my side.
Yesterday they were asking for rs. 4700 and today they asked for rs. 7700. They are harassing me by calling continuously and sending threatening mails. And moreover when i called the advocate and asked him why my qc was failed he replied in a very harsh manner and even used slangs.
I am a student and i cannot pay this much amount of money. I am providing my phone number please contact me, i need help coming out of this mess.

Regards,
Aurba mitra

Aurba. [protected]@gmail.com
[protected]