Standard Bank Home loans not complying with request

Home loans department call center is completely ***********. I've called 3 times to ask them to simply change the debit order date of my home loan because I'm chanhing jobs, and my salary will be paid on a different date. I've had 3 different stories telling me to call back at a different date in order to make the change. This should be a simple thing to schedule the change after I make payment.