ABSA Vehicle Finance poor service

ABSA Vehicle Finance will tell you to send the details in writing via an email and then 3 weeks later they still do not attend to the mailbox. I emailed the details to get my debit order account details and they did not update anything until I had to call back and the consulted offered to change the details whilst I was still on the line and then they go on to debit the old account and charge me for a failed debit order whilst they are the ones that did not update my details on their system as I asked weeks ago. Bad customer service!!!!