Horrible service and cant meet SLA

I have a home loan account with ABSA, when I signed the paper work I requested for the debit order date to be on the 26 which they made an error and made it for the 20th. I found out when I called to know when will the debit order be only to find out the dates are wrong. Was told by the call center agent that if I want to change only my debit order and not my husbands will need to go the the branch. On the 12th of September I went to the branch and after standing in that long que was told they cant get hold of the department as they could not see my account details to make changes on the dates. I was asked to sign a form and they took a copy of my ID and my husbands and was told I will get a call on Monday. A week later still no call and today I decided to call and am still not getting any feedback. Should I miss a payment due to the wrong date entered then my credit record will be ruined and will be seen as a bad payer whereas the mistake was done by ABSA themselves. The service is horrible and what happened to the SLA agreement of assisting a client on a certain period of time. Am sure ABSA wont take that long to blacklist me but cant resolve their mistake. This is unacceptable