A Plus Enterprises — cheated for payment

Address:

Mumbai City, Maharashtra

Hello,
I am middle class engineering student wanted to earn some money that will help to deposit my fees in college. I saw the advertisement of A plus enterprize in mumbai mirror,which provides data conversion,data entry job. I worked on 2 assignment given by them. 1st was nt completed. but I completed 2nd assignment.
now after 15 days i went for my payment as per their clause, they said "only ONE MISTAKE IS ALLOWED ON ONE PAGE". & refused for the payment. this condition was not told by staff while registering & also it is not mentioned in Contract Form.
The money I Paid for enrollment was was borrowed from from others. I need to pay them back. I have worked like anything to complete the target. If you are not paying the money for my work, atleast give me the amount i paid for enrollment.
also if it is ZERO ACCURACY JOB then why so many criteriasare given. Its really Impossible to give ACURACY with SPEED.
please help me!!