ITC : GSTR - 9 : TAX LIABILITY

Dear All Experts,

we are going to file GSTR-9 for f.y. 2019-20. the department already issued notice for non filing of annual return. in that notice the department proposed tax liability by dissolving the itc by the taking cut off date 22.10.2020. the dealer argument is, it is not my issue i already paid to my supplier and i have invoice copy to avail itc.

please suggest how to file annual return, whether in dealer point of view or department view.

thanks & regards

B Ganesh