****st service ever!!!!

SO I want to move my debit order from the 25th to the 1st of every month according to Nedbank I must provide them with 2 payments for them to move it again you pay them for a service but do not get any !!!! I phone them on the 5th of this month and it shows on the system a manager said they will phone me back the next day and nothing you have to phone the just to not be assisted !!!!