Thank you for bringing to my attention the queries concerning invoices [ ] and [ ]. These are now being dealt with and you will be contacted very soon with our findings.
Meanwhile, may I ask that you pay the undisputed part of the account which is now overdue amounting to £[ ]. Will you please send your payment to reach me by [date].
I have arranged that, from now on, my colleague [name] will contact you a week before the due date to discuss with you any outstanding queries so that these may be resolved quickly so avoiding overdue payment in future.
Credit services manager
|Payment terms||:||X days from date of invoice|