40th Wedding anniversary gift ruined by Discovery

Wednesday 8th July I order gifts and flowers through Netflorist to send to my parents in South Africa for their 40th Wedding Anniversary. I am in Australia and select to use my Discovery miles to pay. I cannot use them as my OTP is going to an SA cell number that I can't access. I can't use my Discovery credit card either for the same reason. I call the call centre to change the OTP to my email address they have on their system. I'm told it will be actioned right away. 24 hours later it is Thursday 9th July and the OTP has not been changed. I try the call centre again.They can see my ref number. The guy tries to be helpful but his hands are tied - the query has been escalated to credit card and they are not attending to it. We call back again and speak to the same guy who is trying to be helpful. He escalates again - credit card tell him to tell me they will call me. They try once, I answer, we get cut off. They don't try call me back. I can't call and get stuck in a call centre again. It is too late for the gift. I had to make an alternative plan with the gift but why should I be made to stress like this from another country. I still can't spend with Discovery. ref***