What is the reasonable lapse of time between each reminder in order to comply?
We recommend that an outstanding invoice should be reported as from the moment it is 3 months old, which means that 3 reminders have been sent monthly. If you do not get any reaction after your reminders, it is highly recommended to contact the company by other means (fax, email or phone). In the case the reminders were never received, you will save time by informing the company directly and not sending more reminders.