Filled Invoice cancelation

Anil Addikam   27 March 2021

Dear Sir, 

We have raised an invoice in sep-2019, and sep2019 GSTR1, filled IN Jan-2021, due to late filled, customer has not claimed it, now he asked for new invoice with the present date, so how can I cancel the last invoice, can i Amended in GSTR-1(9th column) or any other way give me a suggestion.

I am unable to raise the Credit Note, due to customer not shown in their books also.