Invoice Postpone to Next Year

In the F.Y. 2016-17
We've issue a invoice of Rs.3,85,000/- (Inclusive Service Tax)

but client purchase department did not forwarded this invoice to Accounts Department

F.Y. 2018-19 (Now)
Accounts Department demanding a current dated invoice with GST for the pending payment

Pls describe how can i adjust previous amount & procedure to postpone this invoice may be better