CALL CENTRE UNABLE TO ASSIST CHANGING DEBIT ORDER DATES

i have tried to call the old mutual call center ***and i have been sent back and forth from one department to another for 15 min, this is very disappointing because no one seems to know which department they need to transfer me to. This has been a waste of time and my airtime , I need to change my debit orders to change on a different date,because i have changed my job from one place to another.i Feel disappointed in the feedback and response i have received and feel that it would be best for me to invest were i would be appreciated, and have cover were is convenient for me to call, i also tried the online app hoping it would solve my problem but there is no option for changing debit orders.what is the use for assistance telephonic-ally or online if no one is able to assist.