Rcm confusion

caclub member (accountant) (45 Points)

17 January 2020  
service took from xyz cargo.he is registered but gst no not mentioned on the slip. charges paid total 2000/-.gst tax not mentioned in the bill.
1.should i pay rcm on 2000/-.
2.earlier i paid rcm from cash ledger,and took itc manually ,but while reconcile 3b vs 2a,the amount of rcm not reflected in 2a,hence shows as pending liability.
what is treatment to offset the liability.