WESBANK - REALLY POOR SERVICE

I emailed WesBank on 2 January 2020 to ask them to change the debit order date to 25 of each month instead of 30/31. I received a reply that assured me my enquiry had been forwarded to the relevant department. Noting no change in this regard, I reminded WesBank on 1 April 2020. I was then asked to send a signed request and a copy of my ID, which I did two days later, 4/4/2020. But nothing has changed till today. It has almost been a year now. I mean, how much of their precious time would it take to click a button or two to change the date? I also need to change my residential address but I know it would be a complete waste of time.