Debit order change joke

I recently changed jobs. The new company's salary date isn't fixed, and can be between the 25th to the 30th of every month. As a result I am trying to change my vehicle's debit order date to the 1st as this will alleviate any future debit order headaches. Yet, Absa is making it basically impossible without a payslip showing my salary date so the debit order date can be set to the new salary date. Now, it doesn't matter if I supply you with a payslip as the salary date will be different every month. Can this really be that difficult to comprehend? Consultants keep telling me they "have a process". OK, fine, but your process doesn't work. So what now? Absolute joke.