Sales invoices not entry in GSTR 1.

pawan shaw (22 Points)

14 April 2021  
From FY 2017 -18 to 2019 -20 there was 4 sales invoices not posting to gstr1 . Party did't get ITC. Now party unable to pay my dues of 4 bills. I paid tax of four bills. what can I do?
how can I solve the problem and recover dues from debtor? kindly suggest me