Application to income tax department

Dear Members of CCI,

I have got an Letter from SBI that my refund for assessment year 2011-12

has been adjusted with the demand of A.Y 2010-11.

But I have neither received letter of Demand nor Intimation mentioning such Demand.

Now I want to know on what basis such adjustment made.

My Question is to whom Application to be made to know the reasons  & asking for Intimation.I had file the return for a.y 2010-11 manually.

Thanks & Regards

Rohit Srivastava