Worst experience with Wesbank vehicle finance

I have had a bad experience with Wesbank vehicle finance. I always have to call the collection department to make a payment. I checked with them a day or two before my first debit order date and they confirmed that everything was set on their side not knowing they will call telling me about a bounced debit order. Reason I called was with the issue that happened at the dealership as I was signing the icontract. He cancelled the mandate saying that the system won’t let him continue. He started over without a new mandate set on my banking app. Wesbank also sent me an email saying that I requested a change of debit order date of which I did not. My new date is the 26th and I get paid on the last day of the month. The interests they add on my account on the 26th are way too much. I tried to call to try and fix this. I even called the regional manager Laura Jane Hunter after talking to the dealership to try to assist me with this issue. She told me that she doesn’t understand why I was given her number and that she doesn’t have access to customer’s accounts. I emailed Wesbank customer service on the 20th of July and I only received an automated response. Nobody contacted me. The consultants I talk to always tell me that they will talk to their team leaders and that they will get back to me and they don’t.