Part refund

We have filed the income tax return of our client for A.Y.2009-10 claiming refund of Rs.2500.The tds amount was around Rs.10000 and 26AS doesn't show any credit to his account.
It was a salary return and original form 16 was submitted along with the return as required.
the department has issued refund of Rs.400 jst before a month.
If the TDS amount is disregarded,then there would be tax payable,but the department issued the part refund.

what are the alternatives of getting full refund in this circumstance ??