Collabera Data Tech — not transfer my money after getting work done by me.

Address:	142, Sidhshilla Apartment, Near JivanBharti School, Timaliyad, Nanpura, Surat, Gujarat, 395001
Website:	Collabera Data Tech

They send me below link of the website:-
http://collaberadatatech.com/
With id and password
... I opened and completed their required work...
But now they are demanding 4000 and then they will pay to me...
I told them to detect 4000 from my work income... But they disagree... That i found wrong... Because i have completed their work of approx 17000... They can detect and send me the rest but they are disagree..
Even the qc report which they sent, i found it wrong too...
Please help me to get my money back