Unresolved Query since 27 May 2019.

On 25 May 2019, I had a NIB item on a delivery. On 27 May I contacted Queries requesting the process involved in resolving NIB items. On 30 May, I submitted acc, inv, batch no's and item code. On June 4 I am advised of the NIB process - NO mention is made of the 40 day rule. The item is included in a subsequent order, but I am invoiced a second time. I again request advice on how to resolve the issue as I am unaware of the process and have been invoiced again. On 29 August, I am advised of the 40 day rule, unfortunately too late as 3 months have passed. My NIB credit is denied due to the 40 day rule. I advise Queries that I do not accept the decision and my request is escalated to the Regional Sales Manager on 25 Sept. In the interim I was threatened with a late payment fee, which has now been debited on my account. It is now 10 October and I have had no feedback.