Absa vehicle dissappointing

In January Absa failed to debit my vehicle account on the agreed date which has been the 27th for the past 5 years... I called them for which they assured me that it has been debited I shouldn't worry... I told them how impossible that was since my bank acc does not reflect such... They said to wait a few days all would be sorted... To my surprise I get abused all through the month for failure to pay my installment, get threatened with blacklisting... Remembering the fact that nothing bounced from my account... Until eventually mud month we agree to arrange for payment of half the installment end Feb and balance end March... Great... End march the agreed payment of half the previous installment was debited but the original installment still not debited... I called them via using my resources and told that the transaction bounced... How does it bounce when I have money in my account and all my debits went through, including the arranged amount? I am 😤 frustrated with the bank because this *****s my name and its not my fault... I have never missed a payment since 2017 and then to get harrased with calls with threats... I spoke to a lady yesterday who promised that debit would go through today but still... What do I need to do...