Please don't transfer my call

In the last 2 days I have acquired a new cellphone number and tried to contact the FNB Customer Careline to assist me with the process, however, after i got through to a consultant she said she would transfer me to the correct department but instead i kept getting transferred to the beginning of the FNB automated menu. I then went on to the FNB website and logged a complaint. I got a call today from the FNB complaints department to assist me only to get transferred to the FNB automated menu again. Despite this frustrating system, I followed instructions from the complaints consultant only to get told my Cellphone Banking number doesn't exist. When I tried to speak to a consultant about this, she transferred me and the whole frustrating cycle would begin again. Please assist me as all I would like to do is update my cellphone banking details without visiting an FNB branch.