Income Tax refund

I had filed my returns via the Internet (efiling) for AY2008-09. I was suppose to get a refund of 24,000.

For the next year also (AY2009-2010) i filed returns via Internet. I was to get a refund of 4000.

I recieved 4000 (AY2009-10) whereas i am yet to get the 24000 (AY2008-09).

For AY2008-09, the Form 26AS that i recieved on email from NSDL has only 2 TDS entries, whereas if i go to the Incometax website and check the Form 26AS for AY2008-09, there are 12 TDS entries.

Can anyone guide me as to how i can find out about the 24000 refund. Any help would be highly appreciated.