E-proceeding status is closed within 2 days of communication

I have received an outstanding demand us 143(1)a for the same there is a communication letter in e-proceeding. But the status of e-proceeding is closed and response for the communication is agreed while I have not submitted any response. As this demand is incorrect as it shoes that I have not mentioned income under other sources as 26AS. But my ITR clearly shows that I have declared same amount in ITR as in 26AS. Please suggest what to resolve this issue?