Seem to me like you are reluctant to proceed.
In fact, Credit control should get feedback from customer if there are any issue with operation after you have made a call to inquire the payment based on due date.
How come you get back and ask me with my own question? I was wondering what is going on with your side now? Hesitate to make decision?
Anyway, I will check with customer and if there are some outstanding issue, I will address it accordingly and inform you immediately.
If not, you need to proceed your process right away.
Hope this clear.