Cannot change my debit order date

This is such a frustrating experience. I have tried to update my debit order date on your app - it does not have the functionality. I try to call your contact centre (as per your app's instruction) and your contact centre gives me 5 million automated options before I can choose one. I then choose "change bank" because there is no "change debit order date" option and your automated version tells me to refer to the app. This is ludicrous. All I want to do is change my debit order date, it's not rocket science.