Notice rec.under section 74

Dear sir 

Recently we have received an show cause notice from gst department regarding dobule eway bill generate few supply for the period 2018.19,

In this regard we have completed GST audit by gst officer up to 2020.21period,  after that department send scn, this is only part load material supply, first eway bill generated by supplier during the goods movement, when goods not delivered then customer generated new e way bill on same goods,

Kindly advice what to do