Billing date not adhered to

Im am a very upset and disappointed customer for mercedez benz, i bought a brand new car 3months ago. The debit order day is the last day of the month every month until this contract comes to an end. August ended yesterday 31st, no debit order came through, today still nothing. Being a proactive customer, i contacted the call center where i spoke with Lerato and her subordinate, who clearly did not understand my frustrations, firstly the address written there is wrong, i dont know how, secondly sge told me to wait for 3 working days before they can know whether the debit order was successful or not. Insisting that her system shows the debit order went through yesterday, but when i asked her to send me an email with the screen dump of that she refused. I want the person who changed my debit order date to be fired, if the debit order is is not running by the end of today, i will take it as a gift from mercedez benz for this month, meaning i will not pay again tomorrow or any other day after that until i get a full report in writing that explains the delay, what actions have been taken to correct this problem going forward. I demand to be treated with respect as a paying customer, the terrible customer service i will not tolerate at all. From lindiwe Nhlapho, ********** 833084, contact number ********** 871.