Thank you for your response, and condolences for your loss.
First, let me assure you that I understand the delay in paying my invoice. I would appreciate it if you could let me know at your earliest convenience when you’re likely to be in a position to process the payment.
Regarding my invoice, I have a copy of the purchase order, delivery note, and invoice in soft copy in case you need them later.
I would appreciate your advice on how to proceed.
Again, you have my deepest condolences for your loss.