Crosoft Technology — regarding the fraud as penalty amount by company

Sir, my name is shiv, in recent days, i have taken work from the crosoft technology of 150 pages and i submit it on time with accuracy but they still tell me that you are unable to get accuracy and due to which they are taking penalty amount as 6500rs INR. Please help me, i m unable to pay such amount to them. They told me that they will do file a case against me. Sir i am a student and studying, if they do these things then my future will get dump. Please help me, i request you. As a student, i don't have such amount to submit. This company is located in surat and i get call from RITU SHAH named girl whose contact is [protected]. They get harassing me a lot.