Stranded in Thailand because of my Discovery Card/FNB

This is not directed at Discovery itself but it's disaster of a partner FNB. I am in Thailand right now using my Discovery card for point of sale no problem. Before I left I unblocked the card for international travel and gave all my travel details to both Discovery and FNB. I asked about changing both my payment and One Time Pin notifications from SMS to my phone to my emai, I was told it take 3 to 5 working days to be in effect. I promptly called a week before my trip. And happily my point of sale transaction notifications are going to me email. But when I tried to load Grab Taxi and had to authorise a payment the OTP clearly was still going to my SA number which is not active here. I have been emailing Discovery for days and my family have been calling Discovery while I am on Skype to verify details and Discovery have tried their best to solve this problem of FNB's making. But when we go to FNB, they won't talk to me on Skype, they won't allow me to verify so they can talk to my family, they won't fix a problem that they have created unless I call them in SA and I can't!!! I don't have international calling here. I also can't book my domestic flight out of ****et, literally I am stuck in Thailand because of my Discovery card/FNB!!!!!