Discovery Bank doesn't get back to you

I would like to formally lodge a complaint regarding my ongoing experience with the Discovery Bank credit card application process. Despite meeting all the affordability criteria for a Black Credit Card, the online application system repeatedly indicates that I only qualify for a Silver Card. I contacted Discovery Bank twice, and on both occasions the agents advised that they would investigate and get back to me. I am still waiting for feedback, and no explanation has been provided. One of the agents even mentioned that I am not the only customer experiencing this issue. I then reached out on Twitter for assistance. However, I was asked to provide extensive security information publicly, despite already having supp**** my ID number. I do not understand why my complaint cannot be escalated based on the information I have already shared. It feels as though Discovery Bank is intentionally avoiding resolving the matter and redirecting me back to call the contact centre for a third time, which is unreasonable and highly frustrating. I request urgent clarification and proper assistance in resolving this issue.