Dear

Your goodwill is extremely important to us.

That is why we have allowed you to continue to charge purchases
to your account in spite of your outstanding balance.

We cannot, however, allow this to go on indefinitely, no
matter how much we value our relationship. We must
insist that you contact us and let us know what is
happening, or send us your payment to clear up your
outstanding balance, before we can fill another order
on credit.

Please let us hear from you.