Discovery Bank's service deterioration

I am extremely frustrated as my credit card application process started on 12 February and it is not yet finalised until present. I was asked to install the Discovery Bank App on my mobile phone with the assistance from one of the consultants at discovery call centre, but I was unable to log in on the app. Thereafter, I kept on calling the centre daily seeking for assistance, and every time I was given a different answer by a different consultant. They all assisted me online and sometimes they would suggest that I disable Wifi and/or my Vodacom data as this could be linked to poor network connection. Eventually, on 20 February at 00:37, I spoke to Kagiso who indicated that it was a software related issue. So he requested that I submit the picture of the error and the model of the iPhone that I am using which I did. He told me that I would get a call from the IT department which I have been waiting for until this day. On the 21 February at 17:03, I spoke to Vuyo who this time identified the issue and said that it my profile seems to be the problem. The problem could ensue from the fact that I previously had a discovery credit card which I paid in full and closed the account in October 2021. She requested that I email her a picture of either my ID or Driver’s licence so that she can send it to the ***** department, thereafter they will be able to match and integrate my profiles, and I will be able to login. I have been waiting for the feedback until this day. In the meantime, I was asked to submit documents such as my proof of residence, proof of income and 3 months’ bank statements which we submitted manually to ***, with their help. This morning at 08h10, I received a message both on my email and phone advising me that my credit card application has been approved and I need to accept the offer before it expires on 03 March 2023. That is when I phoned again the credit bank card department and I explained to them that I was still having login problems on the app using my phone. I further mentioned to them that I was previously advised to use another phone, which I did by using both my wife’s and son’s iphone handsets but I still was not able to login. The call centre agent, put me on hold and she said that she was talking to her manager after which she just dropped the phone and thereafter, I received a reference number. I now don’t know what else I need to do. I can't accept the offer as I cannot access the bank app!