Query regarding credit note

Mackie (Entrepreneur ) (290 Points)

15 November 2020  

Hello Friends, 

Our agreement with a firm already ended in Sept but inspite of telling them multiple times they raised invoices for Oct and Nov month. Now they have raised credit notes for gst for Oct and Nov months which are visible in our 2B. 

We dont have any intention of availing input tax for Oct and Nov as our agreement ended in Sept. What do we do in this case? Are we liable to honour the raised credit notes? If yes, how do we do this? What if we ignore the credit notes and do not claim input tax for Oct and Nov? 

Pls. help