Pathetic Service from RMB/FNB

We (myself, wife and 2 kids) arrived in Australia 30 December and currently we are in the 14 day compulsory quarantine in Sydney. On day 2 my child locked me out of my banking app and I can't unblock my profile as the OTP is linked to my SA number which is not active in Australia. Meaning I have no access to my funds which is essential as I need to buy items like baby formula and nappies which is not supp**** while you are in quarantine. I tried phoning the FNB international helpline (1 Jan) but my calls where never answered. I then Whatsapp'ed my private banker explaining how urgent the situation is, he ensured me that the situation will be resolved in 24-48 hours. Since then it's been 4 days and after numerous phone calls I still I have no access to my banking app and spend about R750 on international calls. I had to rely on acquaintances in Sydney to assist me in sourcing nappies, formula and other essential goods as we have no access to any of my FUNDS, how embarrassing?!? This is totally unacceptable, unprofessional and pathetic service for RMB/FNB. How can RMB/FNB think this is ok the leave a family without any funds in a foreign country. I can't wait to get back to SA to close my account. Regards Marius