Vces

sir i filed servicetax retun from 2008 to 2012 drcember under vces sheme for a pvt ltd company. The calculation sheet along with vces 1 i delclerd there total tax liability is 400000/- the calculation is the following 2008 - tax 150000/- 2009- tax 100000 - payment made appropriate period 50000=50000/- 2010- 100000 - payment made appropriate period 50000 =50000/- 2011 - 100000/- till 2012 oct- 50000/- after they closed the business. but now the problem is the department not allowing the challan paid appropriate time. they dissallowed that 50000+50000= 100000/- we all redy paid under sheme sheduled first instalment before 31-12-2013. 200000/-(50%) .what will we do for adjusting that challan amount.