Global Star Solution — payment not received

I have completed an online form filling work of 1000 forms of the company global star solution within 10 days. The cutoff is 900 and i thought it is to complete 900 forms compulsorily. Unfortunately, i have done 980 forms within the time period and the next day i have been punished with the amount 7, 800 and they promised to give this amount return after completing the work. And i have sent the completed workload without an error (I can say with confidence i have double checked the entire 1000 forms). Now they are saying the partial workload is failed and so we can not give the money of the 20, 000. Kindly help me to solve this issue and i request you to return at least the money i have sent to you.