Challan mismatch in tds return

Ridhi Dhoot (Accountant) (25 Points)

28 June 2018  

While filling TDS Return of Qtr 4,Details of 2 Challan i.e. BSR Code and Challan no. got exchanged with each other,Now I have received a notice for demand.When I checked on Traces,I found both of the challan were showing up in Matched tab but One of them was overbooked.I am unable to file online correction now.Guide me regarding such correction.