Auto populated ITC in Annual Return colmn 8A - Goods and Services Tax - GST

One of my client has been served a notice with the issue of excess availment of Input Tax Credit for the period 2018-19. The GSTR-2A of the tax-payer reflecting ITC of Rs.9407542/- while the 8A column of annual return GSTR-9 reflect an ITC of Rs. 10066878/-. The department has taken the ITC available in 2A for calculating differences in ITC availed and ITC available. While considering the ITC in 8A of GSTR-9 there is no differences found. How to reply to the show cause notice issued?