Dear

Your file was just placed on my desk for disposition. It
seems that your account is seriously past due. We have
valued your business for many years, and can only hope that
this lack of payment is only an error or an oversight. If
you have mailed your check, thank you. If not, please
advise this office if any discrepancy exists. I have
reviewed the account, and feel I must advise the management
to cancel existing credit lines unless payment is received
within ten days.

I understand that you have had problems lately, and feel
that we have been most accommodating. Accordingly, I will
expect your check no later than