Dismal Accounts System

I have spoken to 5 different people in Johannesburg and Cape Town (including your collections and accounts departments). I’ve requested invoices, and to date, have not received any of these outstanding accounts. I am required to pay Lancet for INR tests that were done. It has come to light that some of my payments were not allocated correctly (as far back as 2015). I’ve requested that these invoices be mailed to me individually (not a statement), in order for me to scrutinise and rectify, as not even your accounts department can (or want to) give me answers, yet I’m being hounded by your collections department. And as a side note, ALL your calls are recorded, please refer to them as backup to my aforementioned claim. Please could you send me ALL outstanding accounts as INDIVIDUAL invoices in order for me to settle my account?