NEDBANK No alternative option to change your cellphone number without a branch visit.

It is beyond me that in this day and age, Nedbank cannot provide its emigrating customers an option of accessing their accounts without using the South African phone number. I cannot access my SA number as I now have moved and I believe from countless emails and phonecalls and research that the only way I can do this now is to go into a branch and change my cellphone number in person. Now considering the travel bans with Corona, even if I had the disposable income to "fly to SA" and change my number in person, this is not possible. Can we not have some modern solutions to these problems? this is my money and I have a right to access it. I need a solution URGENTLY.