Welcome to the Middle AGE where your OTP only reaches you when you are in South Africa

So my credit card details changed while I am overseas. I get all the emails threaten to disconnect me. I do NOT get OTP from them on my phone while overseas which is what I need to make alternative payment. They can not send that damn OTP simply to my email. NADA... Their Whatsapp service is PATHETIC, no alternative to OTP apparently I am told, NO possibility to pay my outstanding bill via EFT. I have entered new credit card details with them-still they have disconnected me today. I am beyond ****ED OFF.