Credit extension to past due account

Our credit department has notified me that your
account is past due. You are one of our preferred
customers and therefore we want to offer any
assistance we can. We know that most overdue
balances result from clerical errors. However, should
you require additional time to settle your balance,
please feel free to give us a call at [phone number].
I will see to it that you are granted an additional [#] days
in which to pay your account balance. We value your
business, and sincerely hope that this gesture will be
of some help. Thank you for your kind consideration,
and we look forward to seeing you soon.