Surplus tax with itd

Hi,

In one case an ITR for AY 2009-10 was submitted online in March 2010, later IT Dept sent a demand letter through sec 143, income tax payer submitted demanded income tax by around Nov 2010, which is being reflected in respective 26AS form as well

Now IT dept is deducting the same demand from refunds of subsequent years and while on requesting Sec 143 form, its always showing the same old return with same old demand, even though IT dept themselves adjusted some income tax from subsequent years

Now what can be done to get this corrected and get the surplus tax back

regards