Buyer Immediately Requested Cancel

So I have a buyer who, not 15 minutes after placing an order, requested a cancellation because he could not immediately pay. I do not have instant checkout set up. I got him the invoice the same day and explained on the invoice that due to the provided reason for cancellation, I would proceed with the sale because the payment link in the invoice would work. It has now been a week and he has not paid. Should I initiate a non-payment report? Or just cancel the order and block the user? The user only has one review.