Changing verification of transactions to my email address

I am out of the country on business. I need to perform transactions via online banking but the only way to verify the transaction is via my cell phone that only has international roaming for Whatsapp, and am not receiving SMS. I spent about 45 minutes on an international call providing verification and jumping through all sorts of hoops to get the verification to be sent to my email address as an alternative. I was told it would take 48 hours. I have heard nothing. This is not what I expect from FNB. How can this be so hard ? I need to access my bank account online. How hard can it be ? Change the ****** verification to go to my email address please - immediately !