Debit order complain

I have been communicating with Avbob since March to change my debit order date as my salary date has changed and it's not changing I logged complains via emails for the past two months and every time they say it has been resolved by they still debit me on the wrong date and my bank charges me R115 for a failed debit order and my credit score becomes affected because basically every month I have a failed debit order and I pay bank R115 because of Avbob. I did mention that part on every email I sent to complain but still the issue is not being resolved. I don't know if I'll ever get this resolved or just cancel all my policies with them. Last email confirming the change in July was from Muzi Mdluli