Hertz accounting

Firstly the service at the desk where you collect your car from was speedy and friendly and helpful, so for that, I cannot fault them. The front desk team was great. However, the same cannot be said from the billing department/person. I am saying person because in my mind they must only have one person working on their finances because I cannot see how else no one can actually pick up a phone in that department. Secondly, their arb amount of R275 'handling' fee for fines is ridiculous. What exactly did you do that constitutes handling the fine. I received an email and that was that. I took responsibility and did the necessary to resolve the fines and I phoned back Hertz to let them know that it has been resolved. I also paid their invoiced amount for 'fine handling'. This was in July / August of 2017. So according to me this was all paid and sorted out. BUT then I receive an invoice in November 2018 - OVER A YEAR LATER - to claim an additional R550 for fine handling (apparently it is R275 x 2, so it seems they charge R275 per fine). Really? For sending an email? Anyway the ridiculousness of the amount aside, how does it take you over a year to wake up and realize that you incorrectly invoiced me? send me further invoices? Why did they not include these additional 2 amounts in the initial invoice they sent? Or did I maybe already pay this amount but they don't know what is going on in their accounting department that they re-invoiced me. I cannot remember the exact amount I had to pay and paid because IT IS SO LONG AGO. Who was sleeping and only decided to wake up now? This is unacceptable in my opinion. If you send me an invoice and I pay it on time I expect the who issue to be resolved. So now finalising payments with Hertz actually means you should be on high alert because they might just send you more invoices years after the fact. Oh and don't try and phone them to resolve or discuss the additional mystery invoice because no one picks up the phone. Talk about great customer service.