Discovery OTP service issue

I have tried buying some items on discount from one of Discovery's online partners and wanted to use my discovery miles. Prompts me for an OTP that should be sent to my email but I never receive it. Called the Web support - No proper assistance. Called Card support - say their service is down and can't help in any other way as their OTP staff leave at 4 PM. But the first time I call them was just about 3PM and they just bumped me around departments not helping in any way. This is utter worst customer service. I am trying to use MY miles that I OWN as money and they can't allow me get access to IT when I really needed them. I am losing a discount of about 1000 Rands for this issue of Discovery. If they knew that they are having issues since morning, surely they should provide some additional support staff from relevant departments !!!!!! I am seriously considering moving away from them.