I filed ITR1 for AY-2018-19 with no refund. I got a tax demand of 10000 under sec 245 for section code 1431a from cpc. Till last year i got intimation u/s 143(1) no demand or refund is pending.
I received no mail indicating reasons for demand . the site shows that there is no mismatch of TDS.
MY question is how do i know what is the reason for the demand and what action i should take.