Discovery Bank makes banking with them impossible

I've been trying to issue a secondary card now for three months with no success - something so simple and basic with other banks. I've been talking to an assistant every week after which they promise that the problem would be fixed within 48 hours and of course nothing is done. The problem is with their app which they know already as they advise us usually to reinstall it (which never works). The last assistant, Thato Ngakane, promised to call me after 48 hours if the problem is not fixed, but of course, another week later, no sign of her. It seems like a major problem as this is the only way to start banking with them, but surprisingly it hasn't been fixed for the last 3 months. I'm tired of waiting and I'm considering withdrawing my account to a bank that takes their clients seriously and more importantly wants their business!