No Assistances in changing banking details

I've called ABSA vehicle finance 2 times since middle July in order to change my banking details for my debit order to go down end July. Every time they give me an email address to send my documents to. I've also emailed ABSA 3 times already without any luck. My vehicles installment did not go off end July due to ABSA not responding to my emails. Know I don't know if they decided that I can have my car for free or if they just don't want my money. I will now wait till someone from ABSA call me in order to change my banking details, as I've done my part in sorting this query out without any luck.