Poor Service vehicle finance

I am extremely disappointed in the service from ABSA Vehicle Finance, for the past few months now I am constantly having issues with my debit orders, the debit order goes off and the funds ARE there, they then take it off and last month they reversed it despite me showing the funds were in the bank account and taken off and then reversed. This month the month was debit and I have received 3 threatening messages about my credit score. I have now paid for my vehicle 2 x this month and yet I STILL RECEIVE threatening messages. This has also happened to my tracker. I am beyond disappointed in the service I am receiving from ABSA . I have been with ABSA for many years but I think its time to move on