ABSA - Vehicle Finance Complaint

I have a car financed with ABSA, in December 2017 I requested to change the debit order details to the FNB account from standard bank. My son is paying the car and they advised that from the 25th Jan 2018 they will debit from FNB, then on the 31st Jan I got an sms saying I missed a payment only to find out they didn't even attempt to debit from the FNB account. I called spoke to a consultant and they said they had not typed the Branch code hence the debit didn't run, so going forward it should run.

I just got another sms today saying I missed payment. The money is on the Account they didn't debit AGAIN. This is becoming frustrating now and when I call the call center number ***I don't get any assistance.